Abandoned Nazi train station turned underground astroparticle laboratory.

The final resting place of the great navigator, or maybe his brother.

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

Village situated on a narrow volcanic escarpment.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Bacteria and algae give the salty water its bubblegum hue.

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

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.

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

An off-the-beaten path cave with an underground lake.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

From working out of his garage to the James Beard semifinals, one Tucson baker has kept his fan base—and his grains—local.

The remains of this rugged homestead ranch offer a brief glimpse into a bygone era.

Limestone caves with spectacular showcase chambers.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

The Magical World of George Phar Legler.

This historic national park is covered in the stunning ruins of red rock pueblos.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Dramatic river bend surrounds a natural red-rocked pedestal.

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