Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A town trapped in time - 1958 to be exact.

Records of the dead describe the myriad odd ways people used to die.

Infamous and now demolished panopticon prison built by its former inhabitants.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

Abandoned Nazi train station turned underground astroparticle laboratory.

The deserted remains of a luxury hotel turned hospital ward.

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

When the rain falls, this drain system turns into a musical instrument.

Terrifying derelict military hospital once housed a recuperating Hitler.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

An eerie, derelict amusement park in Berlin.

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

An old department store turned Nazi prison turned artist commune.

Cold war icon and onetime "hole" in the iron curtain.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.