The only castle in North America to ever house European sovereigns.

Diego Rivera's massive tiled fountain and failed infrastructure project.

66,000 pieces of art, donated by one of the world's richest men.

Frida Kahlo's childhood home, now a museum of her life and works.

Stained glass windows bathe this botanical garden in cosmic light.

Tijuana's legendary jai alai or "basque ball" palace is now a massive music venue.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

Eighty million natural history specimens call this gargantuan museum home.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Romania's triumphal arch looks out over Bucharest.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Large collection from the 3rd millennium BCE.

An ancient octagonal weather station named for the eight Greek gods of wind.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.