This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This cemetery features modernist statues as strange as its name.

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

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

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

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

A once-secret library of Freemason history in Catalonia.

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

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

This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

This imposing modern citadel started out as a home renovation project.

A Spanish forest is filled with mysterious stone carvings.

An ancient tower built during Roman times as a lookout post still stands to this day.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

Hidden well off the beaten path in Catalonia is this crumbling medieval castle that is slowly being covered in graffiti.

Stunning Roman aqueduct used for 1900 years and still standing.

An isolated village literally built into the crevices and rock formations of a mountain.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

Mountain where Jesus was first tempted by the Devil.

Turntable anonymously received orphans, alms, and groceries.

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