The former home of Samuel Clemens and family remembers the happiest period of the author's life.

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

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

This turn of the century masterpiece has a mysterious goaty interloper.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This traditional garden in the San Fernando Valley doubled for Star Fleet Academy, and is irrigated entirely by wastewater.

A massive sea stack famous for its appearance in The Goonies.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

A bit of retro transportation flair preserved in the world's largest department store.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

This abandoned subway station can still be seen on regular commuter trips.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

A wunderkammer hidden on the top floor of the Hartford statehouse.

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

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

From scholastic to sepulchral - now under reconstruction.