This fortified L-shaped tower is the ancient seat of clan Hannay.

It's said this was once the home of King James V's pet lion.

The remains of an anti-aircraft battery from World War II look out over Glasgow.

The oldest library in Scotland was built from the remains of a church to hold a churchman's library.

Once home to a Scottish baronet, this 18th-century historic house doubles as a legendary art space.

A serene public space nestled within the remains of Glasgow’s Victorian maternity hospital

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

Of course Salvador Dalí lived in a castle...

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

A Spanish town built into the cliffs.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The ancient tomb acts as a calendar that keeps perfect time.

Life-size figures portray depot attendants, train crew, and passengers frozen in time at the oldest railroad station in Arkansas.

This quirky Arkansas wax museum does not shy away from the macabre and the grotesque.

Crafted from ocean litter, this sculpture highlights the ills of overconsumption.

Maine's oldest diner also happens to win acclaim for its elevated comfort food.

Solar powered Spectacle Island features all-green facilities.

Last church of this militaristic WWII style.

Take a step inside the picturesque studio of America’s most renowned sculptor.

A more than 260-year-old crypt built on Boston's oldest English burial ground.