This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

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

A floating cat sanctuary on an Amsterdam canal.

Amsterdam's Red Light District leaves little to the imagination.

Museum preserving torture methods from the past.

Pompeii's less famous neighbor is still revealing her secrets.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A submerged archeological park still holds the wonders of a Roman Sodom.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

An eerie, derelict amusement park in Berlin.

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

Notorious artist squat renovated into legal studios.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.