Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

Home of the International Space Hall of Fame.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

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

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

Legends surround this jagged rock formation in the New Mexico desert.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

See massive fossils that are over 200 million years old in northeastern Arizona.

Opinions differ as to whether this Arizona tree was actually used as a Wild West jail, but that hasn't stopped the town from capitalizing on it.

This classic red schoolhouse is said to have been where Mary and her little lamb went to school.

An artificial crater field that trained astronauts for lunar exploration.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A defunct all-girls college which may be the resting place of H.P. Lovecraft's real-life Necronomicon.

A steampunk wonderland that preserves America's history of industrial innovation.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Solar powered Spectacle Island features all-green facilities.

The homestead of American patriot John Adams.

An eccentric inventor's castle home with its own indoor weather system.

Former abode of notable poet, complete with literary references and stories of ghosts.