A medieval abbey featured on 'Game of Thrones' that dates back to the 12th-century.

This Turkish cave boasts some rather bizarre associations with the King of Mount Olympus.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Admire dozens of life-size animals made from old scrap metal, nuts, screws, and valves.

The largest fountain in Bratislava.

The first, and perhaps only, monument dedicated to Wikipedia.

Gliwice Radio Tower, likely the tallest wooden structure in the world.

The final resting place of the last "gypsy king" of Poland.

This unique railroad museum secretly contains the history of Poland rebuilding itself from the inside-out.

The relics are stored in a silver reliquary, where they can be seen through glass.

The largest toy museum in Poland showcases Europe's history of childhood.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

The ruins of this Brazilian island prison still bear the scars of the bloody rebellion that closed it down.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

Beautiful public park off the beaten path and away from tourists.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

An eerie, derelict amusement park in Berlin.

The summer tourists on these cliffs are thousands of seabirds.

Norway's national monument to fallen seamen.

The world's largest moose statue towers above the highway between Oslo and Trondheim.

This 19th century cyclorama acts like an analogue time machine to a different era.