This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

This handsome house on a hill was home to one of the 18th century's most famous American architects

Richly symbolic public artworks that have been reconfigured for the 21st century.

A one-ton statue of Steve Rogers beautifies the entry to a Brooklyn Bed, Bath & Beyond.

Walk into the 19th century without leaving Brooklyn.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."

A condo complex once housed a boarding school with the 24th U.S. Vice President among its notable alumni.

This giant satellite antenna services the transmission needs of government agencies and cable programmers.

A monument commemorating the discoverer of radio astronomy.

The real-life ‘Severance’ office building.

This water tower commemorates the invention of the transistor on this site in 1947.

Yo, Adrian!

This sign marks the start and end of Matt Green's nearly 10,000-mile quest to walk every block of every street in New York City.

Staten Island's original central park is the former home of the city water supply as well as thousands of immigrant graves.

This stately brick building once provided supplies and equipment to lighthouses across the northeast during the 19th and 20th centuries.

Dedicated to one of the most successful boxers to compete in the heavyweight division.

Designed by the company that provided water to the entire community.

This oldest brewery in the U.S. has lived through fire, Prohibition, and six generations of family ownership.

Outside a small brewery, a Gothic fountain that once provided water to thirsty horses.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

A eight-foot-tall statue resides in the heart of Pennsylvania anthracite coal country.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Take a ride inside a former coal mine in Ashland, Pennsylvania.