Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

The location of the world's first telescope demonstration.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

An unassuming rod in the Netherlands was once the old standard unit of length for the entire Dutch empire.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

These stairs feature the names of Zemun's most famous faces.

Backwards hour and minute hands and a timing mechanism that fluctuates with the temperature led to this clock tower's local nickname.

A restaurant and observation deck built in a unique broadcasting antenna.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A fascinating insight into daily life in the Eastern Bloc.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Fortified medieval tower house with lovely roof garden.

Go inside to really appreciate this 500-year-old technological masterpiece.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

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.

This ancient market is often referred to as the oldest shopping mall in the world.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.