Warsaw's fantastically preserved gasworks...almost.

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

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

The site of the first battle of World War II.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

An underground city of salt.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A unique waterfall that some believe attracts the fairfolk.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

400-year-old garden, restored to beauty.

A open air theatre built on a cliff by an eccentric British woman.

Manchester's abandoned train depot lingers in a post-industrial purgatory.

An ancient theatre in the "little Rome of the Alps."

One of the world's largest swinging bells is a symbol made from the melted aftermath of war.

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

This historic line is a remnant of an ambitious and unconventional project that today provides panoramic views of the Ligurian mountains.

Hike along an abandoned railway up to a popular pilgrimage site.

This abandoned IDGZ station was one of 49 troposcatter stations in the NATO ACE High network.

A small but very fascinating fountain in the center of Rome with four books and a deer carved.

Although called a funicular by both its owner and the locals this historic railroad is actually a rack and pinion system.

Only three columns survive from this ancient temple in the town of Cori.