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

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

Yo, Adrian!

Two mermen, eternally spitting into each other's mouths.

An alley covered with 20 years of bubble gum.

A cave dug by a man directed by ghosts to find pirate treasure.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

The world's largest piece of copyrighted artwork.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

A men’s restroom became a sandwich shop.

Ice cream stand, snack bar, and time capsule of milk conveyance.

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

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.

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

A museum dedicated to the history and exploration of both popular music and science fiction.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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

This replica of the Greek structure is in the heart of Nashville.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

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