A formerly abandoned mental institute, now back in business.

One of the few Glatt kosher delis in the United States is a cornerstone of its Hasidic neighborhood.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

The Hudson River School comes alive at this palatial estate.

Possibly the smallest church in the world floats in the middle of a pond.

The attic and basement house two museums stuffed with oddities like swallowed spoon handles and a shrunken head.

This tiny little island has, as the name says, just enough room for its single house.

This secluded ruin was once a home for exotic plants.

One Brooklyn man's collection of life-size fiberglass statues has taken over his entire yard.

Toxic waste disaster that founded the Superfund program.

An abandoned 19th century quarry in the middle of the woods, remade by unnamed wanderers into a massive series of rock thrones.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

A Manhattan Episcopal church with an eerie underground crypt.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

A winding, cliffside stretch of road overlooking the Delaware River.

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

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

The site of a tragic massacre that spawned a multimedia franchise.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

One man's swirling six-acre monument of stone.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Avoid gangster interaction while window-shopping.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.