Cliffside houses provide a spectacular view from their perch above the valley.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

The earliest known map to show America, discovered by accident at a Paris bookshop.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

Ancient serpentine sacrifice holder that has stood the test of time.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Even in death, he's still your huckleberry.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

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

A downtown park built on top of unclaimed graves.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

When ecosystems collide in the arid Southwest.

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

This cemetery features modernist statues as strange as its name.

A small house in Tazones, completely covered in shells.

The oldest Roman lighthouse still in use.