The legendary giant's severed hand sits on Antwerp's popular shopping street.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

The private train station King Leopold II built for the Belgian royal family now lies abandoned.

Six turbines towering over a wide road for passersby.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

A landscape decorated with enormous skull sculptures.

This tower once served as a radar station during the Cold War.

A naturally occurring amphitheater carved by erosion into the mountainside.

A glacial valley filled with silver beech trees in the mountains of Portugal.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

A unique seaside cave where Aleister Crowley faked his own death.

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

A church of bones, decorated with 40,000 human skeletons.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.