A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

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

At one of the nation’s longest-running professional theaters, the audience used to barter for tickets with produce and livestock.

Country fans may flock to Nashville's music scene, but this Appalachian town is where the genre was born.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

The birthplace of Appalachia's only first lady, who some have dubbed the United States' "first female president."

This tree is a living witness to the beginning of the Civil Rights Movement.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

A museum dedicated exclusively to aircraft used in the military.

Headquarters of the legendary clairvoyant's readings, spiritual hospital, and massage school.

A neighborhood of houses made of poured concrete through a process invented by Thomas Edison.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

One street divides a single town that stands in two U.S. states.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

This Wyoming town is fascinated by a particular mythical creature.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

Miraculous tree that seems to sprout out of solid rock.

This rustic old building is said to be the most photographed barn in America.