Of course Salvador Dalí lived in a castle...

An architect transformed this abandoned cement factory into his castle-like workshop.

A surrealist labyrinth and museum of contemporary sculptures.

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

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

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A temple to modernity, tucked away amid Barcelona's more well known museums.

An ancient ossuary in Rouen.

A strange aquarium with stuffed fish, and almost no water for them to swim in.

Slum Settlement Filled With Mountains of Garbage.

New York City's smallest piece of private property.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

Abandoned railway line circling the city of Paris.

A modern-day Lascaux cave underneath Paris.

This subterranean studio is filled with fascinating kinetic art.

A Cold War secret surveillance tower used to spy on radio communications.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

The only remaining Cold War–era Minuteman II missile control center in Missouri.

There are two dozen tanks just sitting in an open field in Lower Saxony.

Hop aboard a charming bog train to explore this rare open-air museum of peat.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

The nerve center of a massive, state-of-the art radio telescope that sprawls across Western Europe.

This bike path was sunk below water level for maximum wonder.