A former Confederate hospital serves as a remembrance of wounded and dead soldiers.

The airport was once a Civil War battleground, and the earthwork defenses can still be seen today.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

A popular European tradition makes its way to the states on one of America's most famous bridges.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

This monument is dedicated to Balto, the heroic Alaskan sled dog.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

Packed with gear and memorabilia, this museum chronicles the history of skiing and how its rise shaped New England.

Even Henry David Thoreau found this glacial pothole irresistible.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

Maybe the only missile installed in a public park, this Cold War leftover was one of the first to carry a nuclear warhead.

Despite its extensive history, this fort saw little to no combat.

The once-abandoned 140-year-old hotel used in the movie "In Dreams."

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

Wander the sprawling living museum on the site of one of a 16th-century community.

A statue commemorating a 16-year old girl's nighttime ride to raise a militia against attacking British troops.

Connecticut sites linked to the only trial to ever use demonic possession as a criminal defense.