The only remaining historic maritime signal station in the United States.

Abandoned Italianate architecture on the coast of Maine.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

3,200-square-foot mural inside Dartmouth Library depicts the history of America with images of human sacrifice, ancient gods, and other unspeakable terrors.

Believed by many to be the oldest surviving public monument in the United States.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

The second-oldest garden cemetery in the U.S. was also a college brainstorm spot of Stephen King.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

Pluto is still considered a planet in Ithaca, New York.

Salute the leader of the proletariat.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

This historic steamboat is scuttled just a few hundred feet from where it was built over a hundred years ago.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

The magic's in the hole!

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

The most confusing clock in New York.

The site of the deadly Triangle Shirtwaist Factory Fire.

A Manhattan office building is home to the world's largest chess board.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

Commemorating the spot where the famous scientist fed his pigeons.