Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Home of Philip Johnson, one of the 20th century's most influential architects.

The home of aviation trailblazers, in a remote corner of the big city.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

This 19th-century clock has been restored to help withstand the harsh environment of its seaside home.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.