These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

A 2,000-year-old Adena burial mound located along a busy street in Columbus, Ohio.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

This large torch on the Hove coastline helped Sir Francis Drake defend England from the Spanish fleet.

An unassuming churchyard is the resting place of a pioneering surveyor and reluctant namesake of a mountain.

This tiny alleyway is now a shrine to a subculture riot between the mods and rockers.

Regency-era excess on the English Coast.

A 12th century church completely covered in shells.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

Inside this church are the alleged remains of the patron saint of lovers, epileptics, and beekeepers.

A pair of gigantic baby heads greet passengers at Atocha Station.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

Rare recess caves fill this unbelievably beautiful Ohio park.

The largest earthwork effigy in the world.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.