Massive galleon from a box-office bomb docked in Genoa.

An early masterpiece of Le Corbusier, a famed Modernist architect, hiding in plain sight.

The mass grave of the 27 victims of the "Vampire of Hanover."

Blending modern art with Baroque architecture, this wondrous mosaic grotto serves as the late artist's final creation.

An extraordinary mechanical calculator designed by the mathematician and philosopher Gottfried Leibniz.

The oldest living tree in Manhattan comes shrouded in sinister legend.

At the center of London’s oldest roundabout stands an obelisk that was erected in 1771, but spent several decades elsewhere.

An archway adorned with vulnerable flora and fauna.

This sculpture pays homage to the street sweepers of Madrid since its inauguration in 2001 in Plaza Jacinto Benavente.

This historic little railroad runs through some of the most beautiful scenery in Germany.

The castle that provided the setting for much of 'Monty Python and the Holy Grail' is now a pilgrimage site for fans.

It's believed that the dead were once taken out of houses through these now walled-up doors.

This ruined castle is said to be the legendary keep of a Viking princess.

The zoological collection at the Hessisches Landesmuseum hosts some of the world's oldest habitat dioramas.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

This scenic spot is known as the birthplace of Switzerland.

What looks like a normal building is really a hollow facade hiding a subway vent.

An intricate ceramic tile facade adorns this five-star hotel.

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

Largely overlooked, this little fountain on Museum Island is a whimsical tribute to a Prussian king nicknamed the “Fatty Flounder.”

Long before Europeans arrived, Native Americans built an artificial island out of shells that has withstood a millennia of hurricanes.

An 18th-century religious argument etched into stone.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.