This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

Dedicated to a colonial woman who was hanged for being a Quaker.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The world's largest squirrel statue clutches a pecan bigger than your head.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

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

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The 28-foot granite map plots the locations of 40 theaters in New York City.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Read a book next to a Midtown waterfall.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.