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

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

Roman-style pizza al taglio arrives here with magnificent, crackly crust.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

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

Jesus' footprints and the first catacombs in the world.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

This simple frog painting created by musician Daniel Johnston embodies the spirit of Austin.

After 97 years of constant vigilance from the dome of the Texas State Capitol, the original Goddess of Liberty retired to a life of climate-controlled leisure.

The National Park Service’s best-kept secret with views that rival any in D.C.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

This statue of the "father of television" stands prominently in the United States Capitol.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.