An abandoned train station in Munich constructed for the 1972 Olympic games.

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

The video game-themed street art first popped up in the French city.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

There has been an astronomical clock on this spot since the 14th century.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

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

The prototype for all Nazi concentration camps.

A restaurant and observation deck built in a unique broadcasting antenna.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

360° views of the city plus five floors of optical illusions and hands-on science.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

The fairy tale castle of the "fairy-tale king."

Swedish skyscraper with a 90° twist.