Charleston's historic city jail once held everyone from pirates to Civil War POWs.

A museum wholly devoted to juvenescence.

A Circus legend leaves an unexpected endowment.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Little Red Lighthouse under the George Washington Bridge.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

Salute the leader of the proletariat.

Follow the original medieval paths that wind through this intriguing section of the city.

The headquarters of a secretive order is also a beautifully-designed park.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A open air theatre built on a cliff by an eccentric British woman.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

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

Berlin's old airport.

This innocent-looking townhome is actually a subway exit.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.