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

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

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Rome’s legendary peephole vista is also a former Crusader stronghold.

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

2300-year-old Roman road connecting the empire.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

If you've ever wanted to tear Hello Kitty apart with your teeth, this is the place.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Two cannon-like cranes were installed on top of the bank building to fend off bad feng shui.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

Now a public art piece, this curious metal feature originally advertised a tinsmith's services.

These locks on North America’s oldest canal are named after a porcine rock formation.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

The home of an eccentric Edwardian gentleman is packed to the rafters with handcrafted items collected over a lifetime.

A petite castle folly in the English countryside.

A majestic mansion designed in Mughalai style, complete with a turquoise onion dome.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

A small and tranquil hidden garden in commemoration of one of the great Victorian plant collectors.

A miniature village mimics the surrounding buildings so well it includes itself.

Built for herding sheep, these tiny winding lanes with medieval origins and distinctive series of narrow turns are charming walkways for humans today.