Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

Elevated freight railway turned wildly successful urban park.

A semi-scholarly approach to sex.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

The oldest continuously inhabited street in America.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

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

"A hideous albatross in the Hudson River Valley."

This mouldering abandoned mental hospital was once a center for progressive healing.

A near tragic event on this bridge helped inspire the classic film "It's a Wonderful Life."

This old cement mine has been used as everything from a mushroom farm to a recording studio.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

The largest known open fault in the United States is basically a giant natural refrigerator.

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

An abandoned dollhouse factory.

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

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

A once grand hotel is being retaken by the wilderness it once capitalized on.