The place where Samuel "Slater the Traitor" brought the Industrial Revolution to America.

An ancient cemetery with some historic bodies underfoot.

Once the largest gravity dam in the world.

This railroad tunnel was once the longest in Massachusetts.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

This cave was once thought to be a hiding place for the devil.

This site commemorates the former inn and restaurant where the chocolate chip cookie was first crafted.

This beach-side arcade is believed to be the oldest penny arcade in America.

A plaque marks the spot on the bridge where one of the first elephants in the U.S., Little Bet, was gunned down.

Constructed in 1676, this stone memorial is believed to be the oldest veteran's memorial in the United States.

Despite the name, this narrow bridge isn't very dangerous at all.

No one really knows how these old hobby horses got here, but the herd keeps growing.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A beautiful Victorian-era cemetery, complete with a miniature village.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

An enormous, inside-out glass globe built in 1935.

The mysterious headstone of an unidentified bank robber was seen visited, every year, by a woman in black.

An elaborate, hidden model train in the Needham Town Forest.

The Atlantis of Cape Cod reemerges during the lowest of tides.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

Lady LeWinDa Milkzalot showcases Lewis County's dairy farming heritage and boasts an impressive rotation of seasonal outfits.

A tiny village in Upstate New York ushered in the precursor to drive-in movies.