These unique "earth pyramid" clay columns can be found in ravines around the village of Tirolo.

Some of the oldest exposed rock formations in the United States.

These waterfalls can be twins or triplets, depending on how much it's rained recently.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

Hiroshima survivor on Riverside Drive.

From scholastic to sepulchral - now under reconstruction.

The phone booths of New York City have all but disappeared, but their remains were once found in this "graveyard," sadly now removed as well.

One of the last Jazz Age "Wonder Theaters" in New York City.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

Little Red Lighthouse under the George Washington Bridge.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

American involvement in World War I officially ended in 1921 in New Jersey, three years late and thousands of miles from the battlefield.

"Gnome Chomsky" was once the largest gnome in the world, but is now simply tall for his kind.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

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

This derelict building used to house infirm Freemasons, their widows, and orphans.

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

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

Six peaceful acres in a residential neighborhood dedicated to art and peace.