One of the last Jazz Age "Wonder Theaters" in New York City.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Mysterious 500-year-old tapestries depict a unicorn hunt.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Sniff the Titan Arum's rotting flesh.

A hip bar decorated with walls of golden skulls.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

America’s oldest community theater, this Boston club has been in operation since 1877.

Ice cream stand, snack bar, and time capsule of milk conveyance.

An enormous, inside-out glass globe built in 1935.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.