Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The highest peak in mainland Spain is said to be the final resting place of a Muslim king.

The unexpectedly beloved remnants of a controversial thermal power plant.

An open-air "garden" of mural art that changes weekly.

An early 20th-century bullring converted into a modern shopping center.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

The drama of nature in full effect in this Nevada State Park.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A popular European tradition makes its way to the states on one of America's most famous bridges.

An inspired museum dedicated to the patron saint of enslaved people, inside the cloisters where he lived and died.

A huge, bustling local market in Panama City.

This metal church may or may not have been designed by Alexandre-Gustave Eiffel.

The only thing stranger than stumbling onto these philosophical musings is the story of the homesteader who created them.

This outdoor observatory offers stellar views and a scale model of our solar system.

The decaying adobe remains of an old homestead are just off the beaten path in Joshua Tree National Park.

The so-called "Bridge of Thighs" in Palm Springs allows nudists to discreetly cross the road.

Instead of faces, these sculptures have barcodes—statements on societal dehumanization.

This general store offers visitors a glimpse back into the 1930s.

Experience the glam side of air travel without leaving the ground at this speakeasy.

At the western edge of Palm Springs, a rugged desert canyon trail leads to a waterfall at the base of the San Jacinto Mountains.

Explore the wide world of desert plants at this unique Palm Springs botanical garden.