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

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

This artificial cave looks like something out of a fairytale.

Macabre astrological automaton clock dating to the late 1400s.

This formerly-prosperous Silesian mining town was completely demolished in the late 1960s and early 1970s as an attempt to cover up a secret Soviet uranium mine.

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

An underground city of salt.

Relics from an era long gone, sit idle outside this Estonian museum.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

This ferry carries passengers across the Rhine propelled by no engine or paddles but by the river's current.

This scenic spot is known as the birthplace of Switzerland.

A plain wooden seat that once belonged to one of the most prominent figures of the Protestant Reformation.

The gravestone of a famous poet features a fittingly poetic epitaph chosen by the writer himself.

This medieval footbridge in the Swiss Alps is known to attract cliff-jumping daredevils.

This colossal couch is an unlikely monument to Europe's first female Doctor of Law.

This simple apartment may have inspired some of the most important theories in the history of science.

Large Hadron Collider and the Birthplace of World Wide Web.