World's first "penitentiary," meant to be humane, drove men insane.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Statue of a decomposing prince that once held his heart in its hand.

An underwater city for the dead.

These strikingly barren, rolling red hills were caused by bad farming practices.

The internet as provided by a James Bond villain.

The largest hewn stone in history.

An experimental, automotive replica of Stonehenge.

Giant nude woman of Tijuana is also the artist's home.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

The Hanshin Expressway goes right through its 5th, 6th, and 7th floors.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

This everlasting lightning storm may be the world's largest generator of ozone.

Iron Age "bog person" preserved for over 2,300 years.

Home to the deepest rift anywhere on Earth.

Microscopic scenes; some call it novelty, some call it art.

The final resting place of the great navigator, or maybe his brother.

World's largest cave was only discovered in 1991, and now offers tours to the public.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The explorer Captain Cook may have named it White Island, but the Maori call it Te Puia o Whakaari – The Dramatic Volcano.

Centuries-old bridges grown from tangled roots.

North Korea's massive "hotel of doom."