The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

Only open for two days a year, this church links ancient Greek and modern Christian celebrations.

According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

The hallucinogenic center of the ancient world.

This legendary city has been a tourist attraction for centuries.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

This small group of sand dunes manages to pack in a strange rainbow of colors.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Famously misunderstood wonder of the ancient world

A life-size replica of a Spitfire that sits in a quaint suburb.

The place where World War I began.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

This enormous abstract sculpture is part jungle gym, part elaborate noise-making machine.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

Bridge that died in war and was resurected.

A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.

A war-torn Olympic relic is being overtaken by graffiti and nature.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

Oriental bazaar in the heart of Sarajevo.

The first mosque in the world to receive electricity.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.