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

An underground city of salt.

This man-made mound monument was built out of soil from all across the Polish empire.

Learn the fine art of making a centuries-old treat at this hands-on food museum.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

Real bones which are said to have belonged to a Polish dragon.

Inside this Krakow church, an explosion of psychedelic color.

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

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

Once a resting spot for King Fernando VII.

This candy-pink cathedral of Da Nang is also known as the Chicken Church.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

A cenote sitting in the middle of a parking lot shows the Yucatán Peninsula at its most urbanized.

A Danish fisherman spent 25 years covering nearly every inch of his home with tens of thousands of shells as a gift to his wife.

These old World War II fortifications have been transformed into an unusual equine attraction.

Four alabaster giants contemplate the tides on the shore of Denmark.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

Rows of multicolored bathing huts paint the sand dunes with pops of color.

This 12th century, partially destroyed, abbey has had several owners and was seized during the French Revolution.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.