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

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

It's not a typo, now say it five times fast!

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.

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

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

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

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

Even Henry David Thoreau found this glacial pothole irresistible.

A beautiful Victorian-era cemetery, complete with a miniature village.

"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."

Civil War Fort on an island in the Boston Harbor.

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

The site of Paul Revere's historic two lantern warning.

America's oldest archaeological site or a muddled case of wishful thinking.

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