This award-winning men's bathroom was just too beautiful to not allow women to see.

Live long and prosper in Tennessee.

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

An abandoned town is hidden in Great Smoky Mountains National Park.

Home to drunken tower-climbing goats... seriously.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

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

A Memphis park where you can walk the whole Mississippi River in one go.

Mile-long cave system near Great Smoky Mountains.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

The secret city built by the Manhattan Project.

More than five miles of underground passageways.

Visit this playground of waterfalls, caves and sinkholes.

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

Enormous lake at the bottom of a unique cave system.

Home of an evil witch famous within southern folklore.

Believed to be the site where St. Drostan performed baptisms.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.