Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A living art gallery painted on a canvas of Monterey pine trees.

A completely underwater art museum sends a stark message about humans' impact on the environment.

Giant granite sculptures representing family on the northern coast of Spain.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This cemetery features modernist statues as strange as its name.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Largest site of dinosaur footprints ever found includes more than 5,000 tracks.

A valley of unique erosion patterns lends to a view like nothing on Earth.

The world’s highest ski resort was deserted after an 18,000-year-old glacier melted away.

Rocks that take on the likenesses of several recognizable living entities crowd the Wang dong Rock Quarries.

A thriving surf community exists in relative remoteness along the former boundary between North and South Korea.

The best place for scenic views of the DMZ and North Korea.

Over 80,000 carved wood blocks make up one of the world's oldest intact Buddhist canons.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

Walk in the footsteps of the gods and straddle two tectonic plates.

This fairytale-like structure is the last turf church ever constructed in Iceland.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

It's easy to forget what century it is as you wander this rustic homestead.