The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

This ancient market is often referred to as the oldest shopping mall in the world.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The embalmed remains of the communist leader lie within a custom crystal coffin.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

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

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Built by the Ancient Greeks, this chariot bridge is still in use today.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

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

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

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

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This legendary city has been a tourist attraction for centuries.