A century-old network of freight tunnels underneath the city's historic business district.

What was once the largest NFL stadium.

An abandoned theme park with a strange and tumultuous past.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

Portland had a unique approach to Cold War-era protections.

A crumbling mountain resort that looks like it was abandoned in an instant.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

These abandoned grain silos and tunnels are an urban exploration dream.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

There is beauty and history in the ruins of this former company town.

The headquarters of a pioneering cast iron and cast aluminum cookware company is in ruins, but still standing.

The graffitied ruins stand hidden within the Pennsylvania woods.

The crumbling remains of the first Black-owned and operated hospital in Kansas City.

Abandoned businesses, homes, and rusted cars are all that remains of this stopover town.

Operational for less than a year, this mill produced more than 11,000 tons of chrome concentrate in its short lifespan.

An abandoned observatory in the middle of the Illinois prairie.

An abandoned Victorian-era mill in the middle of modern Manchester.

A castle-inspired apartment building that has stood in Birmingham since 1927.