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

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

An ancient necropolis of magnificent tombs.

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.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

Founded in 670, this ancient mosque is an architectural time portal.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

"Holy Wisdom" overlooks the city that became its namesake.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

A vast Communist-era exhibition space in the Bulgarian capital.

Sofia's legislative center is continuously reinventing itself.

A striking symbol of the Bulgarian capital.