The first plantation museum in the United States to focus on the lives of enslaved people.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This kitsch eatery is chock-a-block with bric-a-brac.

A building so large that it has its own weather.

"We Seceded Where Others Failed."

A monument celebrating the idea of reaching inaccessible places.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

America's largest man-made forest was planted in an effort to bring back the past.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

The only road through the heart of Glacier National Park.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

The oldest botanical garden in the world that technically isn't the oldest.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Fortified medieval tower house with lovely roof garden.