This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The former hotel where Tesla invented the radio.

Make a tough dinner decision: Octopus wasabi roulette or bull penis?

Avoid gangster interaction while window-shopping.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Nikola Tesla's former home contains an homage hidden from plain sight.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

This elegant monument to those who fought against fascism is inspired by the shape of the poppy flower.

Depending on the region's rainfall, this church may be partially submerged.

See how paper is made the old-fashioned way.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

An abandoned resort in North Macedonia is a relic from the Communist Party of Yugoslavia.

Stone pillars and a petrified wedding party in the hills of North Macedonia.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

Space-age monument to an early 20th-century uprising.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.