Seat of the Duke and Duchess of Devonshire for centuries.

Be on the lookout for the symbolic insect all over the city.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

The lake that fills and empties itself at random.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Belfast's namesake river still winds below the city center, hidden from sight.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

The oldest surviving wood-frame building in North America is still in the family.

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

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

Bouncing, delightful, mechanical art at the MIT Museum.

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

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

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

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

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

"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."

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.

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