Once in a state of dilapidation, this candy-inspired fortress is now being revived.

A historic grist mill and active sluice on the Black River.

On the Hudson resides one of the largest clocks in the world.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Final resting place of two dozen New York City harbor ships.

Eccentric stone cairns built on a public New York City beach.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

A graffiti Mecca welcoming artists from around the world.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

Visit the monolithic tomb of America's most famous general.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

Lehigh Valley barge No. 79 still gets tugged along - but now it houses a museum and unusual performances.

This micro-industry of Latino cuisine along Red Hook's Ball Fields represents a victory in a food fight with the city.

“Invented in Key West, Perfected in Brooklyn."

Once America's longest-manned military fort, now an abandoned hulk.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

Avoid gangster interaction while window-shopping.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

An urban laboratory.