The largest stone moai on Rapa Nui.

The ominously named cave is home to some remarkable ancient art.

The world's most remote airport.

The first American home of the isolated, egalitarian religion has a trove of Shaker architecture and artifacts.

The largest museum dedicated to Italian Americans on the East Coast is located in a 100-year-old church.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

A landmark in the history of technology and computing is hidden in a tiny Baroque chapel.

Now a retreat center for the faithful, it once provided training for clergy—but it began as a farm owned by a famed financier and his opera singer wife, who built a surprise in the backyard.

A mysterious air force base built to resemble a Long Island fishing village.

This cemetery holds the remains of an accused witch and the man that ensured her freedom.

The villagers of the coldest inhabited place on Earth adjust to unique challenges presented by day-to-day living.

Cold storage for agricultural biodiversity.

This Torino museum honors a soldier who kept the city safe using barrels of exploding gunpowder, losing his life in the process.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

Legend says this sacred tree was a gift from goddess Athena.

Gladiators once walked this ancient, subterranean passage.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Where you'll find anything but nothing.