A layered tribute to the work of mosaicist Isaiah Zagar.

Elevated freight railway turned wildly successful urban park.

A giant toy jack made of numerous welded-together fire hydrants.

Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

A massive sustainable farm designed by the mastermind behind Central Park.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

"Try not to knock anything over!"

At the supposed instruction of Ben Franklin and Socrates, a Spiritualist believer intended to birth a mechanical messiah here.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Founded by the famed children's book artist, this museum spreads an appreciation of the arts through picture books.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The massive machine creates cracking displays of indoor lightning.

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

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

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

Ice cream stand, snack bar, and time capsule of milk conveyance.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

A cave dug by a man directed by ghosts to find pirate treasure.

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

The only structure left with direct ties to the Salem witchcraft trials of 1692.

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

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

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.