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

The first mosque in the world to receive electricity.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This curious sculpture represents the perseverance needed to take to the skies.

This TV tower once secretly housed a GDR intelligence team.

You've probably seen these distinctive orange-tiled columns on the big screen.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Metro station with a claim to rock n' roll fame.

Tiny memorials honor individual victims of the Holocaust.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.

An eerie, derelict amusement park in Berlin.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

This monumental work of art symbolizes the coming together of a previously divided city.

Floating swimming pool within a moored vessel.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

Perched above the bustling town of Kerak is a sprawling, ruinous castle that has witnessed nearly a millennia of Levantine history.

Cartoon clouds and nature-inspired murals have transformed the streets of Kuala Lumpur.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

One of the world's tallest flagpoles.

Hang out with thousands of butterflies in one of the world's largest such enclosures.

A giant baby floats in the middle of Singapore’s nature park.