Visit this playground of waterfalls, caves and sinkholes.

The secret city built by the Manhattan Project.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This historic train station has been converted to a locomotive themed hotel.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

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

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.

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

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

The world's longest known cave system.

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

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

A key producer of charcoal iron in the early 1800s, the structure still stands today.

Home of an evil witch famous within southern folklore.

The first full-scale tunnel built in America is short but scenic.

One Confederate statue that accurately reflects the ugliness of its subject.

The site of the one of the most deadly train wrecks in American history.

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

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

An eccentric inventor's castle home with its own indoor weather system.

An 80-year-old house built out of newspapers.

A 19th-century Baja cantina that many say is the birthplace of the margarita.