An actual piece of the Moon, brought down to Earth by Apollo 15.

The largest collection of historic military firearms in the United States.

This exhibit is devoted to the games and wonder that Hasbro has brought children worldwide.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

This sculpture commemorates the first instance of an American president pardoning a turkey.

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

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

The world's largest public collection of PEZ memorabilia.

More than a century of radio history is told in these displays.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

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

The Boston square dedicated to the dark poet who was born nearby.

These pretty kitties killed and ate as many as 135 railway workers.

An easy-to-miss plaque marks the building that first held this 19th-century telephone innovation.

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

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

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

There are eight natural springs around town, each with a slightly different taste.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.