A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

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

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Visitors can still take a train to this former train station turned museum.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

A gigantic teapot sitting on top of a parking garage in the center of Utrecht.

An ancient Egyptian temple sits within a modern European museum.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

An unassuming rod in the Netherlands was once the old standard unit of length for the entire Dutch empire.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

Once housed in the towers of this Gothic church, this 17th century clock still ticks today.

The remnants of a WWI naval mine that once terrorized the country now decorates a street.

This early 19th-century graveyard is the final resting place of Vincent van Gogh's mother.

It's forbidden to dig within this ancient Roman fort hidden beneath a playground.

An ingenious Dutch land art project uses grass ridges to cut airport noise pollution in half.

A striking memorial to the Jews of Leiden who were murdered during World War II is scattered throughout the city.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

This massive monument towers over the city as a constant reminder of the lives lost during Algeria's hard-won war for independence.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

A natural wonder with mythological ties to the local Ainu tradition.

Japan’s oldest clock tower has been called one of the country’s most disappointing attractions.

A pre-war mansion that survived the modernization of Athens.

The Acropolis house that became Modern Greece’s first university.