Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

One of the now-less-hidden floral gems of the "Emerald Necklace."

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

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

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

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

Funded entirely by volunteers and donors this military memorial features a tank with a comedy line on its barrel.

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

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

This lakeside tower is the third attempt at getting a tourist destination to stick on the spot.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

This is the house that spite built.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

A bygone village occupation lives on via this quaint public chalkboard.

The location of one of the first private Catholic schools in the country, providing a valuable sanctuary during the tumultuous period when Protestant and Catholic students were at odds.

A school used as a model for public education across the country.

This historic Boston building has gone from personal estate to porn theater and back again.

The world's largest piece of copyrighted artwork.

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

One of the indelible moments of the American Revolution took place at this location.

"Mock all and sundry things, but leave the saints alone."