This big empty pig is a nostalgic throwback to mid-20th-century Texas barbecue.

Three hundred years of preserved Spanish colonial history in San Antonio.

Water still flows through the oldest Spanish aqueduct in America.

The first transatlantic wireless communication between the U.S. and Europe took place here in 1903.

"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."

These whimsical works of art tell the story of the city's past and present.

A mysterious stone embedded at the base of a historic Boston building.

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

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

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

Harry Houdini plunged into the Charles River and performed one of his escape acts here in 1908.

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

A century-old factory reborn as an artist-run live-work building.

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

This tower commemorates the spot where George Washington hoisted the Grand Union flag.

Earliest version of the American flag can be seen atop the hill where it first flew.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

A unique columnar residence built in the 19th century.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

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

Memorial to a beloved puppeteer as well as all street performers.

The only surviving building of historic West Boylston, which was flooded to create the Wachusett Reservoir.

In the middle of a New England forest sit the crumbling ruins of World War II-era ammunition storage bunkers.