Dating back to the 1800s, two imposing buildings in Michigan have had countless transformations over the years.

In Grand Rapids, Michigan, a marker honors the creation story of a proud fictional culture.

Hidden beneath the waters of Lake Michigan rests a perfectly intact ship from the early 1900s.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

The headquarters in Salem doubles as an occult art gallery.

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

Dim sum, served in a grand old theater.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

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

A beautiful Victorian-era cemetery, complete with a miniature village.

This empty Detroit high school was too expensive to maintain or destroy.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

A crumbling hospital from the 1850s on Roosevelt Island.

Site of the first pathological and bacteriological research facility in the United States.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

The highest point on the island known for buildings that touch the sky.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.