This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Fortified medieval tower house with lovely roof garden.

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

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

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Ancient snack bar of the Roman Empire re-opened.

The walls and streets of the ancient city are peppered with penises.

Thousands of tiny squares in different colors make up this piece of street art.

This ceremonial mound is one of the first officially recognized Native American historical sites in North Carolina.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

This lab's maddening silence is good for business but bad for sanity.

Thousands of people walk over this fantastic work of art every day, but how many notice it?

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

143 feet of leaping muskie whose mouth can be used as a wedding venue.

This striking art museum holds an amazing series of curiosity cabinets.

The building was originally a gas station built to resemble a Japanese tea house.

To find the "unicorns of the deep" you've got to go downstairs.

Fragments of a massive unfinished sculpture sit near the main quad of the University of Illinois.

The oldest experimental corn field in America is still creating better ways to grow crops.

This unassuming city park is home to three different types of Native American mounds.

The oldest house in Galena, Illinois, now is a reminder of when this city was the world's lead mining capital.

The park that the Chicago Stockyards built.