The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A place for ship-lovers to watch the passage of freighters traversing the Great Lakes while learning about their history.

This small museum is dedicated to making sure the history of the natural ice industry doesn't melt away.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

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

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

An astounding collection of medical specimens, including bits of President Lincoln.

A dazzling display of red rocks weathered into spires and hoodoos.

The fifth-longest natural arch in the world, and the longest outside China.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

One of the first commercially successful anthracite-powered iron-making operations in North America.

This demolished goliath of American industry once loomed over the depressed town it once made thrive.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

A converted hangar displays dozens of helicopters, from a famous 1943 rescue chopper to several autogyros.

A well-preserved example of an early industrial operation in the northeastern United States.

A piece of crumbling highway infrastructure was repurposed as a high-tech facility for testing racecars.

This museum is dedicated to the first coast-to-coast highway.