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

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

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

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

A former connection to City Island, it has been abandoned since the 1930s.

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

A long abandoned hospital building on the outskirts of NYC.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

A formerly abandoned mental institute, now back in business.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.