The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

The original place where water met land in the City by the Bay is outlined in brass.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

This 11th century tower is said to be the oldest building in Oxford.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

Eighty million natural history specimens call this gargantuan museum home.

An early 20th-century bullring converted into a modern shopping center.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Europe's official "zero-level," the equator of elevation.

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

A towering monument in Spain has proven to be more labor-intensive than initially planned.

This lucky bronze frog was gifted to Madrid by a casino.

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

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This cheese shop also houses a museum devoted to Dutch dairy.