Remote, beautiful, and stigmatized, Las Hurdes is Spain's version of Appalachia.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

A neighborhood park in the city of Cáceres hides what some believe are revolutionary examples of Neanderthal cave art.

For more than two centuries, the canopy of this venerable tree has been a haven for songbirds and lovers.

Pagan monument converted to Christianity with the population.

A neolithic tomb converted into a tiny chapel.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

On a trail in Portugal's Barão de São João National Forest, a pile of faces look up at hikers from the forest floor.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

Menacing or in memoriam, the Silent People and their meaning are left to interpretation.

An unusual house built using an iso-elastic membrane.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

An amazing collection of wax anatomical models and terratological models.

World's tallest cigar-shaped radio tower.

Once the home of a hermetic monk, this cave now houses a small church.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

A museum in the childhood house of a medical pioneer.

A relic of World War I that now exist as a piece of public art.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

The shell of a medieval fortress offers commanding views of the area it once protected.