Week-long block party becomes a competition for the best decorated street.

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

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Mountain where Jesus was first tempted by the Devil.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

An ancient Egyptian temple in the middle of Madrid, Spain.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

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

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

A beautiful but toxic fountain of mercury.

This cemetery features modernist statues as strange as its name.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

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

The symbolic center of Ireland, this summit also offers panoramic views of the countryside.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

This colorful and fiery mural depicts the Irish folk story of the beloved hero Cuchulain.

Some of the saint's blood and bones are said to reside in Dublin.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.