Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Civil War-era Fort designed to withstand invasion and attack, with tricky traps called "murder holes."

Civil War Fort on an island in the Boston Harbor.

The world's largest piece of copyrighted artwork.

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

The New Bedford Whaling Museum in Massachusetts displays what it calls the world's largest ship model.

Three prestigious academic collections come together to create a world-class natural history museum.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A monument park dedicated to the influential Beat Generation author and poet, Jack Kerouac.

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

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

One of America's first spies started out as a teacher in this little red one-room schoolhouse.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

The smallest covered bridge in Maryland.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The lead horse on a Disneyland merry-go-round that is older than the park itself.

Allegedly haunted by Walt Disney himself, this inconspicuous lamp is always kept lit in his honor.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.