Conjoined twins Daisy and Violet Hilton were stars of the vaudeville circuit.

This nine-story building can be played like an instrument.

This scented city oasis was a labor of love.

A permanent outdoor art installation made up of more than 100 mushroom-shaped lights.

The ruins of a 19th-century mill are hidden along a greenway in a prominent Charlotte neighborhood.

A psychological self-portrait in the form of a giant, segmented head.

During the American Revolutionary War, iron excavated from this mine was used to make swords, cannons, and more.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.

The last refinements in the North Carolina-South Carolina boundary were marked with this stone.

This ceremonial mound is one of the first officially recognized Native American historical sites in North Carolina.

A different Edgar Allan Poe built this charming Victorian home.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

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

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 harrowing climb along West Virginia's jagged spires is one of the only Via Ferrata on America's east coast.

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

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

One of the last active volcanoes on the Eastern seaboard.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

This historic mansion was built as a symbol of love between a husband and wife.

Take an otherworldly journey in a school dedicated to out-of-body experiences.