The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

A rare double mill nestled along the banks of the Aa river.

An iconic location along the Los Angeles River where countless movie scenes are filmed.

The original movie set for the home of 'Star Wars' hero Luke Skywalker.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

This memorial museum chronicles the apocalyptic destruction of the First World War.

After 11 years of reconstruction work, Slovakia's finest hilltop chapel complex is finally reopen to the public.

The world's newest astronomical clock is also its most accurate.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

The elegant manor house where Kaiser Wilhelm II lived in exile after World War I.

This old-school café is famous for serving coffee, chilaquiles, and the Cuban Revolution.

Old Danish castle immortalized in Shakespeare's Hamlet.

Copenhagen's celebrated theme park and gardens.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

A mansion where wonders of Christmas are celebrated all year long.

Plans for this local observation tower were debated for so long, the allocated funds lost value and the design had to be changed.