I got a bunch:
-The Shadow Temple from Ocarina of Time. Total mindf***.
-2Fort from Team Fortress 2. IRL, it'd probably make for epic paintball/laser-tag CTF games. Give us weapons like in the game, minus a few, of course, and we'll make due.
-Level 1-2 from the orginal Mario Bros. Just imagine going into a cave like that...
-Luigi's Mansion. Good for a few laughs, maybe some real scares if done right.
-The Chozo Ruins from Metroid Prime. Amazing...
-The first Dr. Wily stage from Megaman 2. Great music and a giant robot dragon. That is all.
-Shadow Moses Island. Good for either lazer-tag/paintball, or just touring around.