Made from trees and then abandoned, this fence is still growing along a path in Germany.

"The most colorful grottoes of the world.

Living trees form the structure of an open-air palace.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

A triumphal steel arch on the side of a German mountain.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

An archeological treasure trove stumbled upon by a couple of children.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

The ancient tomb acts as a calendar that keeps perfect time.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A small collection of magic tricks and memorabilia is now an apartment-sized museum.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

An aluminum skeleton brings Chinese mythology to the French shore.

A landscape decorated with enormous skull sculptures.

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

This abandoned mining village was predicted to resist decay longer than any other modern human settlement.

This Norwegian satellite station provides ground services to more satellites than any other facility in the world.

Cold storage for agricultural biodiversity.

The world's northernmost brewery uses water from a 2,000-year-old glacier to create its beer.