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.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

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 old 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.

Marvel of green building techniques that sings with the wind.

Two small chapels housed inside an ancient tree.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Hundreds of hidden passageways weave through the old quarters of Lyon.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Ozymandias’ time-keeping temple.