This mysterious artificial cave has long puzzled New Englanders.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

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

This historic patch of real estate offers a glimpse of colonial Boston.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

This landmark cemetery in Boston was created more than 300 years ago.

Dim sum, served in a grand old theater.

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

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

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

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

The Mysterious Witch Bonney, a haunted statue in an old industrial city.

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

Radical Bookstore and Community Space.

This memorial garden is the final resting place of many beloved pets including that of a famous explorer.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

This cave was once thought to be a hiding place for the devil.

A historic bridge no one is allowed to cross.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

This enormous banquet-themed artwork honors over 1,000 notable women throughout history.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Makers and sellers of the original and finest York Ghosts.

Found: Garden of Eden in Miami-Dade County, Florida.