This abandoned train tunnel has been the subject of countless ghost stories for years.

The remains of one of the last mining camps developed on the New River.

A monument marks the location of the first successful steamboat demonstration.

Home of a 28-foot tall stalagmite known as the War Club.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

America's post-nuclear-attack chambers of Congress.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

A small Wyoming town is home to the state's oldest-operating soda fountain.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

Discovered after draining a local pond, these ancient man-made caves are still a complete mystery.

This massive underground salt mine now holds a sci-fi theme park in its depths.

A collection of the best toys ever made, The National Toy Hall of Fame is filled with kids, fun, and for some reason, a bird preserve.

One person's lost luggage is another person's treasure.

Railroad came. People came. Railroad left. Town died.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

An obscure waterfall that looks like something out of a fantasy novel.

The history of whiskey and all of its boozy glory, from Colonial days to modern American cocktail culture.

This centuries-old pueblo church houses the body of a Franciscan friar who is said to be a rare "incorruptible" corpse.

An emerald-green grotto just a short trip from Austin.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

An abandoned stretch of highway, deteriorating next to the operational one.

A mysterious castle built as a monument to lost love.