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

Mile-long cave system near Great Smoky Mountains.

Visit this playground of waterfalls, caves and sinkholes.

Home of an evil witch famous within southern folklore.

Enormous lake at the bottom of a unique cave system.

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

This stretch of highway is said to be haunted by ghosts of settlers whose graves were paved over.

A former hospital is now home to a pizza parlor and maybe a few ghosts.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

The only Florida state park with publicly accessible caves.

A hidden beach at the end of a tunnel of mangrove trees.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

Bad farming practices caused this unnatural natural wonder.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

This neoclassic cathedral also houses what is believed to be the oldest clock in the Americas.

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.

These Honduran caves earned their magical nickname thanks to reflective bone deposits.

Remote Honduran Islands with a colorful history.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

Millions of dollars worth of sculpture decorate this Iowa city center.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

The quiet canyon has a tumultuous history involving a doomsday cult.