my list
Port Authority Bus Terminal is one of my list.

1. Port Authority Bus Terminal

625 8th Ave (btwn W 40th & W 42nd St), New York, NY
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David T.David Teicher: There's a hidden door near gate 224. It leads to a secret tunnel system built by J Edgar Hoover. It's a bit of a maze but if you follow the right wall, you eventually end up in Ohio.