Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

This abandoned sea fort has become an accidental bird sanctuary.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

During WWII the U.S. Navy conducted primitive drone strikes on this Lake Michigan lighthouse.

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

This little gem of Spanish Colonial architecture has been abandoned since the 1950s.

An abandoned, decaying sculpture garden built by an eccentric physician in the 1920s now looks more like a forgotten cemetery.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

An enormous overgrown greenhouse teeming with graffiti and wildlife.

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

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

This schoolhouse for Black American children is one of the oldest remaining in southeastern Ohio.

A lawless town deep in Death Valley was famous for its riches and death rate.

This abandoned bridge is now a favorite haunt for graffiti artists.

Home to the abandoned Tioronda Hat Works Factory, this park is a combination of woodlands and marshlands.

Historic seaside park featuring explorable, abandoned military structures.

A former hospital is now home to a pizza parlor and maybe a few ghosts.

An abandoned munitions storage facility with a rich architectural history.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.