Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

A clear example of the process of erosion in action.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

This remnant of an old railroad is the tallest surviving wooden trestle bridge in Victoria.

Equipped with thousands of LED lights, this geodesic dome-shaped stadium is an engineering delight.

Is there such thing as too many fruit bats? Not anymore.

This former brickworks pit is full of legends about its murky depths.

Go surfing on this urban wave, "hacked" by local surfers.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

The only Shinto shrine in Europe that has been officially sanctioned by Japan.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

Art and a pun, all in one.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

There has been an astronomical clock on this spot since the 14th century.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The most loyal of little dogs, or a Victorian era publicity stunt?