Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

This unassuming North Austin neighborhood was built to test the novel idea of home air conditioning.

The inventor of the Coney Island hot dog rests in a grand mausoleum in Brooklyn.

A plaque on a rock dedicated to a famous, forgotten author, and put in an impossible place.

A massive marble foot is tucked away in a small alley near the Pantheon.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

This giant rock arrived at this quiet park thousands of years ago on the back of a massive glacier.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

The underground sanctuary of a mysterious ancient cult.

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

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

One of the world's earliest skyscrapers.

This historic, one-acre island is the only legal place to camp in the city of Richmond.

This house proudly displays an interactive and continuously changing exhibit of lawn flamingos.

These two strange cones are actually a system of old nautical navigation beacons.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

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

This small church was constructed over the ruins of three temples dating to the Roman Republic.

This strategically-placed fountain creates the magnificent illusion of mustangs galloping across a river.

A riverfront park that both remediated and preserved its industrial past.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

The first "Hut" was actually a small brick building.

The only remaining historic maritime signal station in the United States.