My current single player world. Highlights:
-Multiple auto & semi-auto farms (cobblestone, iron, rainbow sheep, chicken, wheat/potato/carrot, sugarcane, pumkin/melon, etc.)
-Suspension bridge over 250 blocks
-Large Castle (furnished & supplied) & City (over 100x100 w/ 55+ buildings)
-'Burj Minecraftia' 140 block tall skyscraper
-Nether Transport System

Details:

'Farm' Area:
> Keep (~25x25) w/ supplies
> Cobblestone generator
> Rainbow sheep farm
> Semi-auto wheat/carrot/potato farm
> Tree farm
> Auto egg farm
> Auto pumkin/melon farm
> Semi-auto sugarcane farm
> Iron Golem Farm
> Pens with pigs and cows
> Underground pen with mooshrooms
> Snow farm (snow golem)
> Suspension Bridge (over 250 blocks long)
Town Area:
> Large Castle (~50x50) includes:
- Nether portal room
- Large storage room
- Automated smelting system
- Decorated areas (bedrooms, living room, etc.) w/ carpet, furniture, etc.
- Throne room
- Large basement excavation to bedrock (in progress)
> 'Burj Minecraftia' skyscraper
- Modeled after the tallest building in the world (Burj Khalifa)
- 140 blocks tall
- 20 terraces
> Japanese Style Pagado w/ Cherry Tree Garden
> Main town (over 100x100 w/ 55+ buildings & 50+ villagers & 6 Iron Golems) includes:
- Gardens
- City Hall
- Blacksmith
- Church
- Inn
- Farm w/ Barn and Silos
- Mansion
- Apartments
- Houses
- Restaurant
- Shops
- Magic Shop
- Public Bath
- Minecart Station
Other Areas:
> Nether transport system connecting all areas
> Far North area includes mushroom island and jungle
> Houses/Bases near 2 of the 3 strongholds
> Mine system under Farm and Town Areas
> Igloo in NW Tundra
> Swamp House
> Upgraded NPC Village

*****Many Building Designs Credited to ColtCoyote*****
Check out his stuff: http://coltcoyote.deviantart.com/

You should spawn in a glass dome, filled with supplies to survive. See how long you can live.
-NOTE: This map isn't finished yet! Comment for suggestions!-
**If for some reason, you don't spawn inside the dome, here are the coordinates: x= -218 y= 5 **

LP World with : tree farm, iron farm, blaze farm, xp farm, potion room, stable, mob tower, redstone systems, cobble generator, secrets passages with redstone, items sorter and retrieval system, huge cave with all minecraft 1.7 biomes, underground river with enchanting table, fancy oven room and chests room and a lot of surprises! (huge pixel art, big city!). (This map is not over)
Texture pack : Onigiris