The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Limestone caves with spectacular showcase chambers.

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

An homage to everyone's favorite prehistoric cartoon family.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The world's largest piece of copyrighted artwork.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

This impressive Boston holy house is the American mecca for Christian scientists.

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

This popular Boston haunt is reminiscent of a time gone by, when slow cafes and sweet-smelling smoke wafting from patios was the norm.

Statue commemorating the use of ether in anesthesia.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

Historic Hull Street was actually the first street with a proper name in the Boston area.

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

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

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

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