The “Grand Canyon of Maine” is a three-mile gorge full of striking geological features.

Explore the dark underground corridors of this graffiti-covered former military fortification.

Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

Narrow gorges and deep pools created by long-ago glaciers.

The graffitied ruins stand hidden within the Pennsylvania woods.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The remains of what was once the world's steepest passenger funicular.

This abandoned factory on the Hudson River once churned out a million bricks a week.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

Mysterious rocks that ring musically when struck.