A well-worn marker in a forgotten alleyway is all that remains of what had been one of Manhattan's most beautiful buildings.

A heartbreaking monument showing the last morning in the life of Jane Griffith.

The site of the daring river crossing that changed the course of the American Revolution.

Prank calls to this place, originally the "Tube Bar," inspired the creation of a Simpsons character.

Four cars from the old system were once on display, but were removed in 2014.

This small, hidden cove is home to abandoned boats.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

One of New Jersey's oldest churches is a historical treasure trove.

Take a step into the workshop where Edison and his employees revolutionized the world.

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

The real-life ‘Severance’ office building.

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

This mountain clearing, created during World War II for an oil pipeline, provides a view of NYC from 40 miles away.

Devotional offerings and pleas for intercession are left at this Depression-era shrine inside a nature preserve.

The final resting place of a famous 19th-century murder victim whose identity is still a mystery.

American involvement in World War I officially ended in 1921 in New Jersey, three years late and thousands of miles from the battlefield.

In the 19th century, this canal provided power to mills, machine shops, and other businesses in the area.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

Once home to a local bear named "Bruno."

The national headquarters of the dowser’s society founded in 1961.

A botanical garden full of thought-provoking contemporary sculptures.

The first dish to bounce radio signals off the Moon, it was the forerunner to the U.S. Space Program.

This colonial mansion has been home to a staggering number of American historic figures.

The way these carnivorous dinosaurs are posed is an homage to a classic work of paleoart.