This church on a Tohono O'Odham reservation has stood since 1797.

The highest natural point in New York City and all of the Atlantic coastal plain.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

This hidden treasure provides a charming access point along the south side of Baker Park.

This house was the subject of an Edward Hopper painting, which in turn helped inspire the design of the Bates house in Alfred Hitchcock's 'Psycho.'

A fire lookout atop a glacial pinnacle is reached by climbing three vertiginous flights of stairs.

The longest covered bridge in Delaware.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

Two small markers remember the Alamo's feline protectors.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

An abandoned church gets a second life as a massive beer hall and event space.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

The Italian revolutionary's legendary wife is portrayed on horseback waving a gun and holding her child in this memorial on the Janiculum.

One of Rome's most picturesque and original bridges was also a popular choice for Grand Tour artists.

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

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

This is the oldest Roman-made bridge in the city still existing in its original state.

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

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

This curious, round temple is the oldest still-standing marble building in Rome.

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

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

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