Houses are tucked between, on, and underneath giant boulders.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

France's highest manned weather station is the only one still inhabited by meteorologists.

Of course Salvador Dalí lived in a castle...

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

Live-in sculpture begun by one family in 1979.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

Series of underground houses inhabited continuously for centuries.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

Picturesque intersection of witchcraft and ancient Christianity.

The stunning interior of this Gothic church is covered in ornate gold details.

This enchanting hamlet carved into the rock looks like something straight out of Tolkien's Rivendell.

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

Iron Age runes and ruins hide in plain sight along this Portuguese beach.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

This century-old ruined temple was reborn as "The Church of Skate."

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

A cluster of granite granaries perched on stilts.

A submerged village appears when dam levels drop.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.