Ancient paintings known as the "Sistine Chapel of Cave Art."

The beautiful, ornate weather station is the most popular geocache in Salzburg.

A man-made slag heap that you can "ski" down, and is home to the world sandboarding championships.

A remarkable feat of Victorian engineering across the Firth of Forth.

A dozen cast iron leopards stand guard along the length of Aberdeen's Union Bridge.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

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

A Serbian church lit by chandeliers made of weapons.

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

This unique museum focuses on the Siege of Sarajevo through children's eyes.

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.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

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

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

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

With its mine closed, this old village is starting to resemble a ghost town.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Hundreds of hidden passageways weave through the old quarters of Lyon.