In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

A stunning two-story timepiece within a medieval Brick Gothic church.

Metro station with a claim to rock n' roll fame.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A Nazi concentration camp and Anne Frank's place of death.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

The fairy tale castle of the "fairy-tale king."

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

A moving memorial to the fallen and missing from WWI trenches.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This "floating railway" is one of the world's oldest monorail systems.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.