This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

One of the only single-person private gravesites in New York City.

Visit the monolithic tomb of America's most famous general.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

How did a 2,000-year-old Roman column find its way to a Chicago park?

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

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

This theater opened in 1998, but both the building and the puppeteers who perform there have a distinguished history.

This magnificent herd of stampeding elephants has been frozen in time for over a century.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

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

The world's largest public collection of PEZ memorabilia.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

A vast collection of rare books, manuscripts & extraordinary objects illustrating the history of medicine.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

A source of civic pride, though the reason for its construction is unknown.

Rifle through images of skyscrapers, Worlds Fairs, and more in the largest public postcard repository in America.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Genesis of modern hydroelectric power.

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