A popular 19th-century natural landmark is now hidden within a sprawling forest.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

A castle inspired by medieval architecture is hidden in the woods of Connecticut.

The remnants of a 19th-century ironmaking complex hidden in the woods of Connecticut.

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

This whimsically unique butterfly farm focuses solely on creating habitats for the gentle insects.

The oldest place in Hartford is a cemetery with thousands of bodies stacked beneath the grass.

A wunderkammer hidden on the top floor of the Hartford statehouse.

The final resting place of one member of the Amistad slave revolt who never made it back home.

An abandoned Depression-era zoo hidden just off the highway.

A parade of antique steeds offers a quirky ride through history.

A seasonal movie monster museum featuring wax creations by a relative of one of the original Universal Studios monsters.

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

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

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.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

From scholastic to sepulchral - now under reconstruction.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A long abandoned hospital building on the outskirts of NYC.

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

This crumbling little graveyard was saved from the undergrowth by concerned veterans.

The mummified relics of an American missionary.

The famous author's cottage hideaway.

An unrealized dream to wirelessly electrify the entire Earth.