Houses are tucked between, on, and underneath giant boulders.

A pair of gigantic baby heads greet passengers at Atocha Station.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

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

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

This cemetery features modernist statues as strange as its name.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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

A stately palace has been converted into the world's largest cannabis museum.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

The attic of a four-century-old canal house hides a clandestine church.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.