Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

Old cabin-like homes in a rural community untouched by time are known for their vibrant and colorful window shutters.

Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

One of only two places in the world where two rivers cross each other without the waters mixing.

The site of one of the largest prison escapes of World War II.

This giant glowing "beanpole" adds much-needed pops of color to an otherwise drab power plant.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

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

From here, the loch appears to take the shape of mainland Scotland.

Where the sleeping monsters of Scotland's oil industry are left to rust.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.

These remarkable cascades are the jewels of Upper Tees.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

A swath of France so devastated by war it is still forbidden to go there.

This striking fort on the Maginot Line looks just as it did after being destroyed in the Fall of France.

This proud Teutonic warrior rises out of a German forest heralding a victory and measuring lightning.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Bacteria and algae give the salty water its bubblegum hue.