Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

The Decoy Capital of the World.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

A Maryland museum dedicated to Black history, housed in a historic church.

This statue honors the author's groundbreaking family story.

This 16-foot, intricately detailed model of the Gearing-class destroyer has been called the most detailed model ship ever built.

Bermuda triangle lighthouse, site of mysterious disappearances, left to crumble into the Atlantic.

In the Bahamas sits a lighthouse that is among the last of its kind.

This small island off the coast of Uruguay hosts the largest colony of sea lions and fur seals in the southern hemisphere.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Secret refuge and museum of the Duke of Florence.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Fortified medieval tower house with lovely roof garden.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

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

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

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

Where Venice's gondolas go for a tune-up.