Few of the many visitors to this resort town know of its hidden Maya ruins.

A flooded Mexican cave that hides a river beneath the water.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

A 60-room castle constructed by a horse-racing heir.

The oldest still-operating tavern in the United States was once owned by a pirate.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

The sea urchin sculpture is an unusual commemoration of a New England town's seafaring history.

"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 hill that gave the Massachusett tribe, and later the state, its name.

The only remaining place where you can play this century-old game for cash.

The homestead of American patriot John Adams.

The nation's second-ever First Lady urged the founding fathers to "remember the ladies."

This small shop walked so America could run on Dunkin'.

The world's largest piece of copyrighted artwork.

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

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

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

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

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

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

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

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

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