Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

Houses are tucked between, on, and underneath giant boulders.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

Picturesque intersection of witchcraft and ancient Christianity.

A geological mystery on Camelback Mountain.

An urban laboratory.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

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

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

The massive machine creates cracking displays of indoor lightning.

No one messes with the Massachusetts sacred cod, not this time...

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

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

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The world's largest piece of copyrighted artwork.

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.