This elaborate tunnel is the first structure composed of cast concrete in the United States.

Believe It or Not, Ripley once called this chiseled mountainside “New York’s Mount Rushmore”.

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

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

A plaque on a rock dedicated to a famous, forgotten author, and put in an impossible place.

This statue commemorates the importance of hat manufacturing to Danbury, once known as the "Hat City of the World."

This giant rock arrived at this quiet park thousands of years ago on the back of a massive glacier.

One of the last socialist halls still standing in the United States.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

This small plaza encourages people diagnosed with cancer to never give up hope.

An abandoned 19th century quarry in the middle of the woods, remade by unnamed wanderers into a massive series of rock thrones.

Nine nice parcels of land along a flight path offer a quiet respite... until a plane soars overhead.

This crumbling industrial fortress has attracted daredevils, filmmakers, and historians.

Beside a busy highway, a colony of Great Blue Herons raises hundreds of offspring each year.

Where one of the worst train disasters in the country took place, leading to upgrades in rail safety.

The inventor of the Coney Island hot dog rests in a grand mausoleum in Brooklyn.

Nearly four centuries after its founding, remnants of one of the oldest planned communities in North America are still visible in southern Brooklyn.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

This 1836 church, constructed by formerly enslaved people, honors a leader in Afrocentric music.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

An allegedly haunted testament to a local businessman's desire for status, posterity, and charity.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.