The world's most elegant power lines.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

Single runway interrupted by a busy road that cuts across its middle.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Under the desolate and windswept northern coast of Barbados stands a small oasis filled with sea anemones.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

One of the world's heaviest musical instruments towers within a popular urban park.

Floating swimming pool within a moored vessel.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This classic restaurant features a gorgeous mirror-clad room.

The place where World War I began.

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

Oriental bazaar in the heart of Sarajevo.

This sprawling Jewish cemetery is one of the largest in Europe.

A section of destroyed vertical lift bridge stands alone in the Peene river.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

One of downtown Berlin's last reminders of its Communist past.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.