Concrete igloos standing across from what remains of the Michigan Central train depot.

A Beaux-Arts triumph set to become Ford's innovation campus

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

A massive sustainable farm designed by the mastermind behind Central Park.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

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

Mysterious rocks that ring musically when struck.

Soaring over the Niagara Whirlpool since 1916.

Stairs often replace streets on the steep slopes of this old mining town.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

A unique geological area spiked with wind-carved rocks that resemble teepees.

A museum dedicated to the alleged Roswell Incident.

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

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.