Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The fountain marks the area where hundreds of accused witches were burned at the stake.

An enigmatic modern marker left next to a historic Roman site.

An oasis of beauty, tranquility and botanical research in the middle of Rome.

This ancient market is often referred to as the oldest shopping mall in the world.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

A fairy tale castle in modern Rome.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The final resting place of the poets Shelley and Keats.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Architectureal fantasy quarter of Rome.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

A new kind of theme park for adults off the Las Vegas Strip.

The best Tiki bar in Las Vegas.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.