The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

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

The remains of this 2nd-century Roman temple are incorporated into a modern building.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

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

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

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

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

The world's longest and deepest train tunnel.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

100 year tradition of fist fights, marked by marble footsteps.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

This translucent sculpture represents a quintessential component of New York City's skyline.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

The most confusing clock in New York.

Red frames showcase remnants of one of New York's original subway stations.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Unrepaired walls from a 1920 anarchist bomb attack.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.