Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

Art and concrete merge into a single entity within a WWII bunker that possesses a deeply storied and turbulent history.

Cold war icon and onetime "hole" in the iron curtain.

A poignant memorial that traces two hundred years of German history.

Check the time in 145 countries at once with this East German relic.

A brush maker used his factory to protect blind Jews from the Gestapo.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Over time, this castle grew to encompass the entire island.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Memorial to the brave indigenous defenders of the Canary Islands.

The world's largest wooden structure.

This small chapel is built of human bones and decorated with a golden skeleton.

The world's oldest bookshop still in operation.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Thousands of well-dressed mummies below a monastery.

A study of Fascist era Art Deco design in Italy.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

This color-changing crater lake in El Salvador is occasionally impenetrable to sunlight.

Padre Delgado, a leader in the fight for Salvadoran independence, is buried in this stunning Brutalist cathedral.

A trompe l'oeil mural remembers the original colonial building that once stood here.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

Frida Kahlo's childhood home, now a museum of her life and works.

66,000 pieces of art, donated by one of the world's richest men.