A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

These markers are used to determine the ground stability of the Strip.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

Estimated to be more than 5,000 years old, this yew may be Britain’s oldest.

This tombstone marks the spot where the legendary British spy met his end.

A small collection of objects of a bygone era hide in plain view.

This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

Left by the Devil, an ancient quarry or just plain old erosion, this enigmatic rock pillar rises 28 feet from the hillside.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A curious urban windmill once owned by a renowned British mathematical physicist.

A winding staircase that appears to lead to nowhere is actually a diving platform into the Wellington Harbour.

Cryptid lake monster honored with its own monument.

This stream-carved gorge has inspired poets, hidden smugglers, and trained soldiers, all without losing its beauty.

A giant pineapple, a symbol of hospitality, and an amazing vacation rental option.

Built in the 16th century, the tower is now in ruins.

A stone, covered in metal, commemorating an event that happened somewhere else a thousand years ago.

Reminders of the Battle of Berlin still scar the railway.

This platform is now a memorial dedicated to those who were deported during the Holocaust.