The yawning maw of this pagan visage is said to bite off the hands of liars.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

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

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

An alchemist's "magic door" stands in the middle of a Roman park.

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

Architectureal fantasy quarter of Rome.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Anonymously sculpted and donated, these sculptures made from poetry books and pages are sprinkled around the city.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

A 200-year-old collection of oddities and medical paraphernalia.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

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

360° views of the city plus five floors of optical illusions and hands-on science.

A 30-acre garden inspired by the principles of modern physics.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Brightly painted boulders scattered throughout the Sinai Desert.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.