Europe's largest dinosaur museum was founded by a passionate autodidact.

The world's longest and deepest train tunnel.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

These spooky and unusual stone formations create an underworldly landscape.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A remarkable two-country morph, this town is part of Germany legally but is by all other measures Swiss.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

A Nazi concentration camp and Anne Frank's place of death.

This German museum devoted to the simple wonders of salt is actually built over an old saltworks.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

The location of this historic castle was inspired by a donkey.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

A Welsh sheep farm provides daily (non-sheep) meals to red kites, producing dazzling displays of aerial acrobatics.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This architectural oddity is an oasis of green on the outskirts of Valencia.

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

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This strange statue features a bust of the famous composer plopped atop a woman's body.

This "floating railway" is one of the world's oldest monorail systems.