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

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

An enormous, inside-out glass globe built in 1935.

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

An 80-year-old house built out of newspapers.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

An eccentric inventor's castle home with its own indoor weather system.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A sprawling collection of over 106,000 toys from around the world.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A unique geological area spiked with wind-carved rocks that resemble teepees.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

Impossibly life-like natural history models created out of glass by a father and son.

Three prestigious academic collections come together to create a world-class natural history museum.

One of America's most historic homes also holds a startling literary legacy.

Beautiful steampunk ghosts of early Massachusetts.

These impressively detailed battle scenes depict the violence and tragedy of war in miniature.

A historic bridge with a lovely acoustic anomaly.

The world's largest rotating world.

The first "applecore" style lighthouse in Nova Scotia.

"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."

The world's brightest bioluminescent bay.