Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

A home covered with elaborate mosaic and other pieces of art.

Once one of the largest producers of pig iron in the world.

Step inside Lucy, the world's largest "elephant."

Amazingly, this old machine within the Resorts Casino still functions.

Once forgotten, this strip of sand was a rare beachside haven for Black Americans in Atlantic City.

Memorial built in 1922 in remembrance of WWI casualties.

If it feels like a speakeasy, that’s because it probably was one.

This award-winning men's bathroom was just too beautiful to not allow women to see.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Catacombs turned marketplace.

A student driver's nightmare.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

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

A mechanized clock where a man fights off a dragon, crab, and rooster.

A stack of stones steeped in Irish folklore, much like the hero they're connected to, hide in plain sight.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.