Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

World War II bunker still standing on the New Jersey beach.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

Step inside Lucy, the world's largest "elephant."

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

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

The site of one of history's most indelible and horrific tragedies.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

A unique sculpture park that specializes in the huge and bizarre.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

A monument commemorating the role of Alaska's native Tlingit guides in the Klondike Gold Rush.

Originally a brothel during the Klondike Gold Rush, this bar once used dolls to denote when ladies were working.

The first Russian Orthodox church in North America and an Alaskan landmark.

A tiny wilderness cemetery commemorates the deadliest episode of the Klondike Gold Rush.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

A historic freight system that found the true gold rush is in tourism.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Gorgeous cave resemble a winter wonderland.

Beijing's World Park offers the excitement of international sites without the travel.

The most famous location in China was home to whole dynasties worth of imperial rulers.