Experience what life was like in Ireland during the Viking and medieval ages.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

These ancient ruins hide in plain sight next to a dessert shop.

A sharp sculpture made of thousands of pieces of jagged glass.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Old Danish castle immortalized in Shakespeare's Hamlet.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Frequent fliers welcome in this airplane hotel.

This demon atop the Notre-Dame de Paris looks utterly bored.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

A colossal statue with a controversial past, forgotten for more than 30 years.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This small primate research island is teeming with playing, fighting wild monkeys.

The embalmed remains of the communist leader lie within a custom crystal coffin.

The largest retailer of seashells in the world.

The palatial McDonald's that inspired Wesley Willis.