Here is my minecraft singleplayer world!
It contains a big castle, a chatedral, glass pyramide, railway system around the world, a prison, a harbour, a theater, a market, a huge farm and som ancient buildings.
Often updates as the world are in development...

Update 1 now out!

Bomb Shelter Cobblestone Fotress (Updated: 9/21/11)

Is resistant to explosions of any size.
Includes:
[*] Minecart Subway system that works in 1.7 get in minecart in basement.(W.I.P) (Not connected)
[*] Piston boat dock dock with boat dispenser.
[*] Underwater sandcave with tunnel to bunker basement
[*] Double iron doors that work with buttons.
[*] Mineshaft To Bedrock In Basement
[*] Trash Compactor

1.5 Changelog
[ ] Added Slime Farm (transports slimes to mob room down the hall from the catcus farm)
[ ] Added Mob Room
[ ] Added Elevator Out of Slime Farm (Acess in mob room)
[ ] Added Slime EMP Unit
[] Change Sandcave's Ceiling From Smoothstone to Glass
[] Added A Shell to the Day/Night Sensor (Etho's Version)

ToDo
[ ] Build A Station At Cobblestone Fotress
[ ] Add Automatic Wheat Farm
[ ] Add Automatic Sugarcane Farm
[ ] Add Automatic Mushroom Farm
[ ] Add Nether Content
[ ] Add X-Ray Vision Chamber
[ ] Add Mob System (Mayby)
[ ] Add Vault/Arsenol with Weapons And Goodies
[] Connect Subway Minecart Track To Coblestone Fotress

Im using faithful 32 texture pack for 1.8.1 in the screen shot
Heres the texture pack link:

http://www.minecraftforum.net/topic/72747-faithful-32x32-pack-update18-support-18/

Well, just the map of my server :D
(if you want to take a look: spitservmc.dyndns.org)

This is what I've documented so far:

Pyramid:
x:-450
y:64
z: 1235

Round Mountain:
x:-199
y:85
z: 843

Stone Mountain w/cave:
x: -411
y: 66
z: 11105

Jungle Temple:
-883
67
2781

Underwater Mine:
-17
71
4691
A

ANOTHER Underwater Cave
2772
44
5992

YET ANOTHER Underwater Cave (tons of materials, MASSIVE)
2856
67
5975

The map is MASSIVE. So much to explore. I'd love some help!
I'm looking forward to trying this on Survivor...