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

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

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

An abandoned castle owned and ignored by Masons carries a cursed history.

The Connecticut village named for its subterranean thunder.

A mysterious air force base built to resemble a Long Island fishing village.

The mansion home of author Edith Wharton.

World War II bunker still standing on the New Jersey beach.

Why have you never heard of the second most popular tourist site in New York?

Resonating tubes make music from highway overpass.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

Remnants of a storybook amusement park hidden behind a strip mall.

Beautiful steampunk ghosts of early Massachusetts.

A hidden "place of interment for gentlemen."

This innocent-looking townhome is actually a subway exit.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

A group dedicated to promoting boating, kayaking and environmental education programs.

Four cars from the old system were once on display, but were removed in 2014.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The famous author's cottage hideaway.