An abandoned railroad tunnel is now filled with bioluminescent bugs.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

An Australian lake whose pink hue defies scientific explanation.

An obscure waterfall that looks like something out of a fantasy novel.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

New York City's only radical feminist independent bookstore.

This narrow shop in the East Village hosts a matchmaking service for the new millennium.

Join in a Seance at the Swedenborgian Church.

The mummified relics of an American missionary.

Salute the leader of the proletariat.

A living archive of urban activism and space reclaimed.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

Unique antiquarian shop specializing in globes, maps, and prints.

The oldest surviving synagogue in New York City is now a soaring art space.

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

A very classy 1920s-era bar right in Grand Central Station.

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

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

Become a prohibition rebel.

One of only two commuter aerial tramways in the United States.

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