Venice's island of the dead.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

100 year tradition of fist fights, marked by marble footsteps.

The remains of 50,000 World War I soldiers rest under a towering arch overlooking the Alpine battlefields.

This medieval castle was home to a known tyrant and features several hidden passages.

Destroyed numerous times, this centuries-old bridge has always been rebuilt with its original design.

Featuring the last fully walkable parapet walkway in Europe.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

This candy shop has been serving up sweets to the Louisville area since the 1850s.

Visitors to this arboretum are greeted by three smiling giants crafted from sustainable materials.

It's a pretty creepy lock-up.

A luxuriant botanical garden below sea level.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

A mysterious air force base built to resemble a Long Island fishing village.

A haunted hill that supposedly defied gravity.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The first commercial nuclear power plant constructed on Long Island.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

A large camera obscura, constructed entirely from digitally fabricated components.

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

Creating this diorama spurred naturalist Carl Akeley to begin advocating to protect the apes.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.