The world's largest wooden structure.

Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

Intricate metal sculpture that's half gothic cathedral, half construction equipment.

A little sculpture with a large wardrobe.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

This laboratory has a remarkable concrete roof that measures less than an inch at its thickest point.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

Its incredible collections are dedicated to preserving Mexico's film history.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

Abandoned figurines adorn a small plot on the side of a craft market's entrance.

Inside the cloister of the Temple of San Juan Bautista is a ceiling decorated with gold Baroque illustrations.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

Five million people are laid to rest here, more than the population of Madrid itself.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

A huge cathedral single-handedly constructed by one eccentric monk.

In addition to showing films, this one-screen arthouse cinema from the late 1940s is a museum of old film equipment.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

Little-known artist couple chose a former silk factory as the location for a museum dedicated to their work and other avant-garde art.

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.

The vaulted ceiling is home to a scurry of “squirrelgoyles.”

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

Its columns were all carved from the same white oak tree.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.