This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

This 15th century pharmacy displays a beautiful collection of ancient medicine jars.

Religious dwelling in a Spanish volcano.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Wonderland replication in progress by one persistent man.

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

French commune at the heart of conspiracies.

The site of the first medieval crusade that pitted Christians against Christians.

A Spanish forest is filled with mysterious stone carvings.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

These striking ruins of a castle resemble a ship's stern.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Monasteries on rock pillars, once accessible only by frayed ropes.

Mountain where Jesus was first tempted by the Devil.

A modernist church in an ancient village.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

This ancient Spanish castle sits high upon a hilltop.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

This unique Renaissance castle was turned into a home for Nazi occultism.

This ornate Weser Renaissance house was also the home of an infamous witch hunter.