Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

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

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

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

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

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

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

A 120-year-old legend concerning an empty circular patch in the North Carolina woods.

The humble horn finally finds a place in the sun.

This research center for rare prosimians is studying how they sleep to help prolong human life.

A sculptor's dream castle turned fantastical ruin.

Remnants of a storybook amusement park hidden behind a strip mall.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

One of the only memorials dedicated to journalists who died in combat.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

Bizarre Cavern.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.