The hallucinogenic center of the ancient world.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Hundreds of dwarf beeches create an unusual, haunting forest in the north of France.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Unable to build support structures on glaciers, the engineers for this tramway were forced to design a unique system.

An underground city of salt.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

This modest marker near Notre Dame identifies the very center of Paris.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

This legendary city has been a tourist attraction for centuries.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years and harbors many surprises.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

The most famous location in China was home to whole dynasties worth of imperial rulers.