Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

The former home of the "Manassa Mauler" is now a museum dedicated to his legendary boxing career.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

An abandoned sawmill from more than 134 years ago stands testament to the ambition of one man.

World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

Delaware's first railroad lasted only five years and spanned only 16 miles, but its ticket office has survived for two centuries.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

A museum dedicated to the mysterious cryptid.

This Colorado fire station has been in continuous operation for more than a century.

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

In addition to over 80 vehicles on display covering over 100 years of motorcycle history, this free museum focuses on the people who ride and love these bikes.