Here, you can post everything you have built in any server in Minecraft if you want to. Unless somebody already did this before me. You can type it in order built if you want.
My list tells you which server it's built in. Some may not be there if server reset. And if it says "forgot," that means I forgot, and if it says (helped with) beside it, that means it's just something someone else built, and I helped.
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My list (order built):

Forgot: Trap Hole (griefed)
Forgot: Tower

Reddit: Tower
Reddit: Bridge
Reddit: Floating House

nXs Public Minecraft Server: House (griefed)
nXs Public Minecraft Server: Giant Tree with Obstacle Course Inside (griefed)
nXs Public Minecraft Server: Floating Building (griefed)
nXs Public Minecraft Server: Underground House (griefed)

The One's Lava: Tower
The One's Lava: Floating Observation Area

Forgot: House (griefed)

Forgot: Heaven (helped with)

Reddit: Tower (griefed)
Reddit: House
Reddit: Obstacle Course (with target jump)
Reddit: Giant Staircase
Reddit: Heaven

The One's Lava: Giant Staircase

World of Minecraft: Giant Staircase
World of Minecraft: Long Elevator
World of Minecraft: Pier (griefed)
World of Minecraft: Ice Maze
World of Minecraft: Water Fountain (griefed)
World of Minecraft: Obstacle Course (griefed)
World of Minecraft: Giant Staircase
World of Minecraft: Giant Cafe Sign

World of Minecraft 2: Riverside: Water Tower (deleted)
World of Minecraft 2: Riverside: Ice Maze (deleted)
World of Minecraft 2: Riverside: Princess Peach's Castle from Super Mario 64 (left unfinished)

Forgot: Ice Maze

World of Minecraft 2: Riverside: Small Mario (SMB3)
World of Minecraft 2: Riverside: World 1-1 (SMB)

World of Minecraft 3: Obstacle Course (something really weird happened)
World of Minecraft 3: Claimed Land Area (griefed):
-House (griefed)
-Mall (griefed)
-Parking Lot
-Underground Parking
-Apartment Building
-Small Mario (SMB)
-Obstacle Course (with target jump)
-Obstacle Course (with target jump)
-My Username Floating in Mid-Air Above Area
-Tree-Mansion (for admins)
World of Minecraft 3: Underground House (griefed)
World of Minecraft 3: Mall (helped with)

World of Minecraft 4: Claimed Land Area (griefed):
-Fountain
-Greenhouse
-Tree-Mansion (partly for admins) (secret entrance) (griefed) (with target jump)
-Oasis
-House
-Obstacle Course (cancelled)
-Fountain
-Double-Layer Hedge Maze
-The Kid (IWBTG)
-Fountain
-Playgrouond
-Floating Ice Maze
-My Username Floating in Mid-Air Above Area
-Underground House
-Gold Mine
-Pool
-World of Minecraft logo
-Floating Island (griefed):
-Hotel (left unfinished)
-Bridge
-Mini-house
-Outhouse
-Stairs

World of Minecraft 5: Fenced Area (left unfinished):
-Stairs to Bridge
-Bridge
-Tower
-Underground House
-Fountain
-Secret Underground Room
-Spleef Arena
World of Minecraft 5: Stairs to Bridge (Other Side)
World of Minecraft 5: Multicolored Stairs to Floating Theatre

World of Minecraft 6: House
World of Minecraft 6: Spleef Arena

World of Minecraft 7: Underground Area (left unfinished):
-Some... Glass... Thing... (left unfinished) (started with tower)

World of Minecraft 8: Underground Area:
-First Ever Double Spleef Arena!!! :D
-Pool (cancelled)

World of Minecraft 9: World of Minecraft Building Contest: Indoor Pool

World of Minecraft 8: Underground Area:
-Short Obstacle Course
-Guest Area Roof Walk/Observation/Skyway

World of Minecraft 9: Obstacle Course
World of Minecraft 9: Floating Isle at End of Obstacle Course (left unfinished) (with target jump):
-Tower to Roof (with 2 target jumps)
-Bridge Connected (helped with) (with target jump)
-Crappy Wooden House
-Floating Mansion Connected (left unfinished)

Cal's Realm (#?): Nature Based Area:
-Treetop Thing...
-Pond
-Diving Board
-Block Gallery

World of Minecraft 10: Underground House (griefed)
World of Minecraft 10: Tower (griefed)
World of Minecraft 10: Minecraft Checkers/Chess Board (single-block tiles) (griefed)

World of Minecraft 11: My Structure Storage Building (griefed)
-My Username on Wall (griefed)
-Tower to Roof
-Fountain
-Easter Egg :D
-The ummwat Tower (left unfinished)
--Bathrooms and Pool
--Arcade
--Food Court
--Maze
--Maze

World of Minecraft 12: Nature-Based Hide-and-Seek Arena
-Gold Entrance/Pole Area
-Secret Underground Dirt-Pole Area
-Underground System/Underground Passageway to Floating Glass Area
-Hedge Area
-Field
-Floating Glass Area
-Treetop Area
-Elevator to Roof
-Roof
-Roof Ice Area
World of Minecraft 12: Golden Walkway (connected to Hide-and-Seek Arena)
World of Minecraft 12: Hide-and-Seek Arena (helped with)

World of Minecraft 13: Puzzle Tower (LEFT UNFINISHED!!! NOOO!!!) (At least my haunted course on SMP's is a good alternative :D)
1: Lava Jumping Area (lava-cobblestone)
2: Gold Maze
3: Sector 4 AQA (Metroid Fusion) Based Tropical Jumping Area (left unfinished)
4: Deserted Desert Jumping Area (was planned)
5: Room of Nothingness? Puzzle Area (was planned)
6: Golden Ultimate Jumping-Puzzle Area (was planned)

World of Minecraft 14: Hide-and-Seek Arena (left unfinished)
-Golden Entrance
-Counting Box
-Easter Egg :D
-Stairs to Rooftop
-Water System
-Cobblestone (first floor)/Glass (second floor) Partly Flooded Building
-Partly-Flooded Underground Confusing Pole-Place
World of Minecraft 14: Glass Throne Over danny135's "ummwat rules" Sign (helped with)
World of Minecraft 14: Glass Tunnel Connecting to Hide-and-Seek Arena (helped with)

SMP's Land of Love 1: Halloween: Epic Obstacle Course: "Cavernous Time Haunt" (griefed)
-Cavern
-Underground Abandoned Graveyard of the Griefers! R.I.P everyone on this list: http://www.worldofminecraft.com/Minecraft_Griefers (Except theres only eight tombstones. I don't care.)
-Easter Egg :D
-Last Cave
-LONG Elevator
-A Great (But Deathly) View
-Easter Egg :D
-Easter Egg :D
-Leap of Faith
-Deja Vu?
-Secret Cave
-Easter Egg :D
-Gold Tunnel
-Glass Ascension
-Finish!!!
-Easter Egg :D

NOTE: A lot of people rated the course 5/5! (The only exception is fenixfurion who rated it a 4 because "He's not very good at jumps.") I might continue to do these later. There are 5 secrets hidden throughout the course. Everyone's favourite part was the leap of faith including mine. My second favourite should be the deja vu area. (Except the place is destroyed by an explosion.) :D

NOTE: Why did I make a storyline for this? The storyline is that one day you go exploring in a cavern (two thirds of the course). After a lot of obstacles in the way and finding hidden secrets, you end up in hyperspace and go back in time (the leap of faith). You have to try and get out of the loop and discover a hidden passageway and go through it. You see a time machine at the top of a tower (glass tower on back of sign) and try and get there, thinking it's what's causing the time loop. You climb the tower to the time machine and turn it off, stopping the loop.

World of Minecraft Build Contest 2: Epic Obstacle Course: "Lava Flood" (left unfinished)
-Entrance with Tutorial
-A Mystery Hut
-The Lava Fall
-Magma Chamber
-The Volcano (left unfinished)
-Easter Egg :D
-Some Random Cave-Side Rooms
-Easter Egg :D

NOTE: Yet another story. One day, you go exploring and see an explosion. You get to the souce and find a deserted house with blood splattered everywhere. You go out and find the source and run into a lava fall. The lava is running from under the house. You remember seeing pieces of explosives in the house. You go down the lava fall (since lava can't melt or hurt you or anything in the "Creative Mode" in Minecraft) and end up in a magma chamber. You go up a shaft of lava and end up inside a volcano. You see a tunnel of lava in the volcano leading into the tunneling under the house, creating a lava loop. The volcano rumbles and you escape. You run away into a forest while the volcano blows. The volcano is flooding and you have to get out! You find a passage through the area to the exit, and find an elevator. You go up and end up on a floating isle. You see a control panel labelled "ARTIFICIAL VOLCANO CONTROLS". You turn off the lava flood and it stops.

World of Minecraft 15: Epic Obstacle Course: "Mystery of Time and D-mension" (griefed)
-Don't Have to Do Everything
-Easter Egg :D
-Dented Deserted Destroyed Demolished Hut
-Rocky
-Lake Jumping
-Easter Egg :D
-Easter Egg :D
-Confusion in the Forest
-Easter Egg :D
-Giant's Tree
-I'm Gonna Fall a Few Meters
-Wooden Confusion
-Liquid Death Chambers
-Easter Egg :D
-Waterway
-Second Forest But Short
-Hyperspace
-Revisited Dented Deserted Destroyed Demolished Hut with Deja Vu
-Death Tower
-Easter Egg :D
-The D-mension Machine

NOTE: The storyline: You're an adventurer. One day you explore a rocky area. You find a deserted house. You exit into a rocky area full of obstacles and a couple of flooding lakes. You end up in a haunted forest. You see a huge tree and go down it's roots into a confusing cavern. You end up in a magma chamber and go through it, only to end up in the same chamber upside down. You go up a water shaft to and end up in a large waterway. You navigate through the waterway, ending up in another confusion forest, but shorter. You end up in a hyperspace tunnel and appear back in the deserted, destroyed house. You go up a tower of death, and go up to the top, where you find the D-mension machine and shut it down, making all this dimensional distortion stop. Yeah, I know.

NOTE: Special thanks to MrINBN and laCour.

World of Minecraft 16: Aperture Science P0rtal Building: (left unfinished)
-Chamber 00: A replica of the first part in the real chamber 00.
-Chamber 01: A little portal to the other side of a glass wall.
-Chamber 02: Mini "Android Hell" #1.
-Chamber 03: Glass-blocked hall.
-Chamber 04: Portal hallway, turret blocking.
-Chamber 05: Portal to the other side of a glass wall, first elevator.
-Chamber 06: Three-roomed portal maze.
-Chamber 07: Portal falls.
-Chamber 08: Portal merry-go round, portal shaft.
-Chamber 09: Classic Portal end-test-chamber ride.
-Escape 01

World of Minecraft 16: Checkered Board

World of Minecraft 16: Decorated Checkered Board in Guest Area

World of Minecraft 17: Mystery Trail/Obstacle Course: (assigned) (griefed)
-Section 1 Clue 1
-Section 1 Area 1: Hedges
-Section 1 Clue 2
-Section 1 Area 2: Iron Structures
-Section 1 Clue 3
-Section 1 Area 3: Cobblestone Jumps
-Section 1 Clue 4
-Section 1 Area 4: LOL
-Section 1 Clue 5
-Section 1 Area 5: Maze
-Section 1 Clue 6
-Section 1 Area 6: Forested Fountain Pool Tower
-Section 2 Area 1: Cloud Jumps
-Section 2 Area 2: Storm
-Section 2 Area 3: Glass Climb
-Section 2 Area 4: Rooftop At Last!

World of Minecraft 17: gamer1129's Swimming Pool (helped with)

World of Minecraft 18: Assigned Area (assigned)
-Elevator Entrance
-House
-Pond
-Canadian Flag
-Fountain
-Picnic Area
-Playground
-Mansion
-Fountain
-Gold Building Thing
-TRIDDIN RULES!!! Sign
-Glass Building
-:U Face
-SMB World 1 Replica
-Secret Hacks-Only Place
-Glass Spleef Arena

World of Minecraft 18: Claimed Land Area (helped with)

SMP's Groundless: Double-Difficulty Multi-Themed Obstacle Course (in progress):
-Level 1: Tetris
-Level 2: Warp Climb
-Level 3: Dark Obsidian Maze (I'm evil >:D)
-Level 4: Dark Obsidian Course (MORE EVIL >:D)
-Level 5: A Lake (Not evil at ALL >:D)
-Prize: World of Minecraft Movie Theatre
-Hidden Level Prize Prize: Game Tower
--Parcheesi/Ludo
--Snakes and Ladders
--Monopoly
--Checker Board
-Hidden Level (in progress)
--C jumps
--An obsidian pole...
--Confusing underwater glass area (in progress)

World of Minecraft Contest 3: Town Build: CITY UMM (left unfinished):
-Ummwat's Road
-A few cars
-A hotel (left unfinished)
-Two giant "CITY UMM" signs
-A parking lot
-A picnic area
-A flag
-A staircase leading to the underside of the glass border
-"World of Minecraft" sign along underground area of border

Griefed: 25
Deleted: 2
In Progress: 1
Untouched: 86
Pixel Art: 3
Planned: 0
Helped (I help someone build something): 7
Weird Happening: 1
For Admins: 2
Secret Entrance: 1
Cancelled: 1
With Target Jump: 8
Left Unfinished: 13 (Oh noes!!!)
Assigned: 2
World of Minecraft: 112
Total: 132

(8D

NOTE: Almost all of the major things I build has a blue flag on it to mark that it's mine.