Dark Achievement City

Dark Achievement City is an evil variation of Achievement City, built in The Nether. There are slight differences, and lots of major differences, most notably The Achievement Hunter Logo being made of Netherrack, Obsidian, and, Glowstone, and Netherbrick Blocks. It first appeared in Let's Play Minecraft number 56: Hit List. Geoff stated that it would be used in future Let's Plays that have not been revealed yet.

Landmarks and Differences
Gavin's House of Art and Dreams: There is no Trophy Room of Victories, because of Gavin finding a Monster Spawner, and not bothering to destroy it.

Michael's House: One painting is different beacuse Gavin said it was close enough.

Jack's Stilted Shack: Leaky Ceiling remains, but Geoff accidentally burned it down, and while trying to place blocks to stop it he slept in Jack's bed causing an explosion, on account of beds exploding when you use them in The Nether. There is also a sign that says "my mom loves me".

Ryan's Kung-fu House: Edgar the Cow is replaced by a villager, and the Chicken is replaced with an Egg in an Item Frame with the sign saying "In case of emergency, Break Egg".

Geoff's Monolith: No noticeable differences as of now.

Ray's Mud Hut: The residence is made of Soul Sand, not dirt and Slice of Hell is not built. The dirt podium is Soul Sand as well. There are no Roses for Ray to get out of the chest in his house.

The Logo: There is no Plan G to blow up Dark Achievement City.

Stone Bridge: Just Lava instead of Water.

Trivia

 * The Obsidian podiums are upside-down.
 * Geoff and Gavin claim it took them seven hours to build the City, with Geoff saying when he thought they were done Gavin wanted to add something else.
 * The Dark Achievement City Bulletin Board say "Reading is Knowledge, Knowledge is Power, Power kills, Kill everything.
 * Geoff and Gavin burnt down Jack's house four times while building it, once for the one in The Over.
 * They have actual trees in The Nether.
 * The Tower of Pimps is purposefully built upside-down.
 * Jack's house is full of Zombie Pigmen, which Gavin said was like Giant Jack being full of Pigs in Achievement City.