This striking steel sculpture transforms environmental data into art.

A strange and ancient landscape hides the dark, cavernous remains of a 5,000-year-old flint mine.

These grandstands are among the oldest continuously used stands in the world.

A large collection of steam engines, organs, and fairground attractions.

This medieval castle is filled with an eccentric collection that ranges from ancient Egyptian artifacts to taxidermy to a mummified hand that was cut off during a duel.

This unusual 7th-century Frankish seal offers more questions than answers about its past.

A 16th-century footpath said to be haunted by a young girl that died trapped within its misshapen old house.

This imprint of an old computer keyboard has a unique backstory.

Long tunnels run under the ancient chariot racing circuit to the tower.

This Roman arena once played host to bloody gladiatorial battles.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Caves famous for the dragon-slaying saint who lived there.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.

The Greek island's old British cemetery feels like a forgotten garden.

The ghost town where the villagers refuse to leave.

A remarkable medieval structure born from a 14th-century disaster.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

The mystic whose incorrupt corpse still attracts the faithful.

A gaudy painted elephant stands in memory of south Florida's fallen carnies.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.