This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

Architectural monsters are devouring this palace's every door and window.

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

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

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

A massive marble foot is tucked away in a small alley near the Pantheon.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

A Nesting Doll of Churches.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

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

Located inside Hoge Veluwe National Park, this museum began as the private collection of a prominent female art collector.

Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

The arch marks the beginning of the road for northbound travelers.

A seven-story wooden coal tipple stands this former mine, the last of many that once covered this area.

The first outlet of Canada's biggest fast-food franchise has been slinging doughnuts since 1964.

Profile of a sleeping person four kilometers long in 250-meter-high cliffs.

A six-person chapel in the middle of Alberta's badlands.

Not for the faint of heart, this long pedestrian bridge rewards those who brave the wobbly walk with a beautiful view.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

Roadside collection of 65,000 signs.