Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

This semi-secret storybook hedge maze is also the oldest garden in the city.

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

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

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

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

This bridge was constructed from the rubble of the infamous Bastille.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Abandoned railway line circling the city of Paris.

This giant expressionist head crowns a museum devoted to a beloved Mexican leader.

Diego Rivera's massive tiled fountain and failed infrastructure project.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

Come for the flowers, stay for the bats!

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

Furniture tries to escape an abandoned building in San Francisco.