Collection of nearly 500 concrete figures sculpted by the late Veijo Rönkkönen.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

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

Natural time capsule containing an alien ecosystem.

A fiery crater has been burning in the Karakum Desert since 1971.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Largest Roman Catholic church in North America.

The United States Capitol's former columns still stand.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Sculpture that doubles as a time capsule so that life can survive radiation outside Chernobyl.

This attraction was abandoned after the Chernobyl disaster.

340-foot statue built to honour the Heroes of the Soviet Union.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Statue of death tucked in the University of Medicine courtyard.

Notorious artist squat renovated into legal studios.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

A mechanized clock where a man fights off a dragon, crab, and rooster.

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

The exorbitant price of paradise.