World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

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

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This statue commemorates the meeting of the most influential minds of the women’s rights movement.

The little-known final resting place of one of America's greatest writers.

A historic dam made famous for its turbines and feature in a Hollywood classic.

The North Carolina grounds are leased in perpetuity to the British Commonwealth for as long as the WWII sailors are buried there.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

Step back in time on this preserved 1800s farm.

A forgotten sea village stands silent after hurricanes deemed it obsolete.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

For decades, this waterfall remained hidden because of an artificial dam.

A throwback train ride transports passengers through one of the lesser-known national parks in the country.

This restaurant proudly displays bread signed by the 39th president.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.