The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

One New Hampshire alleyway has become home to a public gallery of feline art.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Statue commemorating the use of ether in anesthesia.

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

The world's largest collection of Don Quixote-inspired art.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

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

One of the now-less-hidden floral gems of the "Emerald Necklace."

This ambitious father and son team reigned supreme over the North End, and witches, for many years.

"Mock all and sundry things, but leave the saints alone."

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.

Marigolds, rosemary, Madonna lilies, and the Virgin’s Bower decorate this Massachusetts sacred garden.

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

A restored, one-room African-American schoolhouse in the diva's hometown now preserves the legacy of its most famous student.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Within this beautiful Pittsburgh cemetery, a unique headstone bears witness to one man's eternal love for Jaws.