The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

A misnamed well, with a deep dark past.

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

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.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

A memorial to the beloved brown bear that served in the Polish army during World War II.

This fairytale medieval church in Poland originally spent centuries in Norway.

An extensive network of secret tunnels was created for the Nazi project "Riese."

The scars of World War II are preserved on its walls.

A subterranean display of public art and architecture.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

Bridge that died in war and was resurected.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

Considered one of the oldest surviving churches in Goa.

The shiny silver little brother to Copenhagen's Little Mermaid statue.

Denmark’s never-ending bridge.

This contemplative sculpture made out of old machine parts is meant to be the first in a series of sculptures around the world.

Once a meeting point for great thinkers, and the midpoint of the country.