The secret city built by the Manhattan Project.

The final resting place of the world's first nuclear reactor.

At this Arctic outpost, get to know members of the indigenous Sámi community and meet their herds.

One of the world's largest model railroads is a mind-boggling achievement.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This roadside wonder is as mysterious as it is beloved.

A comprehensive collection of toy and model trains, largely from the mid-20th century.

A crew of die-hard train buffs spent decades turning a defunct stretch of railway in Oklahoma City into a museum now home to over 50 antique and restored trains.

The head of a legendary creature allegedly killed during colonial times is now on display at a local restaurant.

This historic Victorian mansion is allegedly so haunted that a signed waiver is required to enter.

This underground holding cell was forgotten for over a century and rediscovered in the 1960s.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

The real-life site of Ichabod Crane's infamous gourd attack.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The largest self-built castle in the U.S., six decades in the making.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

Roaming bison and a spectacular view at the highest point in Nebraska.

America's smallest town is run by its single citizen/mayor/librarian/bartender.

An experimental, automotive replica of Stonehenge.