This hilltop ruin is of the hundreds of stone columns built in tribute to the first German chancellor.

This 13th century Gothic brick castle is the largest in the world by surface area.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

A haunting deserted hotel is a favorite with artists and photographers.

A World War II torpedo launch station abandoned off the Polish coast.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

The remains of the wrecked steam trawler can be found on the beach at low tide.

One of the most popular attractions in the small resort town of Kabardinka.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an 8th-century Buddhist master.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

The remains of diamond fever taken over by the desert.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Village of slate houses, built on a white marble outcrop.

Camels and crocodiles share the black waters of this stunning Saharan oasis.

One of the most accessible undersea plane wrecks in the world.

In paradise, feral pigs have claimed an island all to themselves.

An eerie, derelict amusement park in Berlin.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.