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

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

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.