This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

A reminder to choose water over wine since 1888.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Elevated freight railway turned wildly successful urban park.

Lie in a hammock where George Washington stood.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Step inside Lucy, the world's largest "elephant."

The rusting remains are visible sticking out of the waters of the Delaware Bay.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

Millions of numbers carved in glass represent the tattoos forced upon victims.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Look closely and you’ll notice that the color changes a third of the way up the tower.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The "lovely red Vega" of the legendary record-settling pilot.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The house where John Wilkes Booth conspired with his co-conspirators.