The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

In which a local geological marvel becomes a quaint roadside attraction.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Home of a 28-foot tall stalagmite known as the War Club.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This simple, broken column marks the final resting place of one of America's most famous explorers.

Follow the steps, and this roadside artwork will teach you how to dance.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

Mile-long cave system near Great Smoky Mountains.

This replica of the Greek structure is in the heart of Nashville.

More than five miles of underground passageways.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Enormous lake at the bottom of a unique cave system.

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