Awesome Dungeon/Maze at unmarked location!

Quite possibly the best location in the game that I have seen so far. I am sure many of you already know about this, but here's the details for anybody else that is curious.

Across the street from Milton General Hospital (south of Diamond City) is a 4 story parking garage that has been converted into a maze of corridors with enemies, puzzles, and dozens of traps. I won't ruin too much, but save your game before you choose what prize you claim at the end.

The first time I discovered this place, I got to the roof of the parking garage from a crosswalk that comes from the top floor of Milton General Hospital. The door was barred from the inside, so I did the power armor glitch to get inside. I did the maze backwards and was so impressed that I loaded another character and did the maze the correct way. Not recommended for a level 4 player, lol!