The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The prison where Hitler wrote "Mein Kampf," and 278 Nazis were later executed for war crimes.

A collection of 4,000 thimbles that's more versatile than one might imagine.

A meteorite-bounded town in Bavaria.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

A moving memorial to the fallen and missing from WWI trenches.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

Christ's blood allegedly preserved in a Belgian town.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

This unassuming sculpture depicts grandfather of science fiction Jules Verne and his brother as children.

The encased skull that is widely believed to belong to St. John the Baptist.

Science fiction's grandfather has a fittingly marvelous tomb.

His "Lionheart" is entombed separately from the rest of his body.

An ancient ossuary in Rouen.

This 19th-century monument served an important purpose for fishermen thanks to its built-in barometer.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

This tidal island, a sacred site in early English Christianity, was the target of a notable Viking invasion.

These upturned herring boats make nifty storage sheds for fishing goods.

This museum honors the young maritime hero who became an unexpected Victorian-era celebrity.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.