One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A little sculpture with a large wardrobe.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

Stained-glass windows inspired by Vincent van Gogh's paintings decorate this church in the town where the artist's career began.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A spiritual vortex among the red rocks in Sedona.

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.

A white Buddhist temple with a golden restroom.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

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

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

A surreal statue honoring Prague's favorite literary son.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

What looks like a suicide in progress is actually a statue of Sigmund Freud.