This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

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

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

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

Volunteer-run library dedicated to exploring five decades of activism history.

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

One of the American Southwest's most extensive collections of Navajo rock art.

The world's first underwater farm is home to more than 700 plants.

The smallest restaurant in the world.

A science fiction-inspired apartment building designed by a famous Spanish architect.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

A tunnel dug through the side of a mountain by hand provides convenient yet death-defying access to a small village in China.

A studio devoted to keeping hundreds of unique Chinese arts alive.

This sensational Chinese temple walks visitors through the 76 weird departments of the afterlife.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.

A uniquely authentic display of traditional Russian culture.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

This probably wasn't what Mao had in mind.

A jagged silhouette of shamanistic stone heaps rises from the shore of this dazzling mile-high lake.

The western-most fortress on the Great Wall of China has gone from a strategic stronghold to a kitschy tourist carnival.

A fifth-century temple improbably built into the side of a cliff.

Hidden treasures belonging to Mongolia's most revered and multi-talented monk spent decades buried in the Gobi desert.

Mongolian Buddhists believe this monastery in the Gobi desert to be the center of the world's spiritual energy.