A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Roman ruins top white travertine terraces formed by ancient hot springs.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A terrific purveyor of natural history objects and curios.

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

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The only microgravity tower in Europe can produce nine seconds of weightlessness.

A spitting ode to a German serial killer.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

A pair of giant stone heads represent the ancient Roman saints beheaded here.

Thousands of flowers create enchanting pink tunnels over the city streets.

A former customs station on the border of Germany and the Netherlands.

A distinctive former power plant turned university lecture hall looks like it could make you breakfast.

This bakery and museum offers tours of the tastes and mythology of Aachen's signature spice biscuit—just don't ask for the recipe.

A slice of central Asia in the middle of Berlin.

Started as a kitchen garden, now the second largest botanical garden in the world.

An eerie, derelict amusement park in Berlin.

With over 10,000 lights, this engineering marvel lights up the city after dark.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.