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

Inside this building is another country within Rome, a sovereign entity without a physical territory.

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

Plaques on its facade commemorate the Tiber's most destructive deluges.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

An elegant church is home to a remarkably detailed mosaic floor depicting the Garden of Eden.

The enchanting home of an eccentric Swedish physicist and author sits in the hills of Anacapri.

This bronze boy sits on one of Capri's rocky cliffs, waving at the passing boats.

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

A painting, bought for one dollar and carried to the church on a manure cart, is said to have instigated miracles and has certainly inspired the construction of an impressive basilica

Cold war icon and onetime "hole" in the iron curtain.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

The site where a plot to assassinate Hitler was planned—and its conspirators were executed—is now a powerful memorial to the German resistance during World War II.

This curious sculpture represents the perseverance needed to take to the skies.

The prototype for all Nazi concentration camps.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Most historians agree that the so-called "Gentleman Pirate" wasn't much of either of those things.

This small memorial is almost as well concealed as Smalls himself was on the night he sailed to freedom.

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The oldest liquor store in the country is a model of resilience and mischief.