This legendary urban waterfall creates a dazzling display of rainbows.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

She become one of the first women to serve in the United States military by secretly dressing like a man.

This clock tower is all that remains of Bird Hall, constructed by one of the founding families of this Massachusetts town.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

The world's second largest single-dish radio telescope, once used to contact E.T.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A single room pays homage to the prodigious achievements of the 30th President of the United States.

Home to the Titanic Historical Society's collection.

Years of archaeology, just chillin' by the water cooler.

These pretty kitties killed and ate as many as 135 railway workers.

The world's most active stratovolcano is almost always erupting.

Italian cave with exceptional acoustics and an unsavory history.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

Illegal drag racing two stories beneath Chicago’s streets.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.