An engraved granite slab claims to mark the location where Leif Erikson built his house in the year 1000.

Historic house still contains bullet holes from an overlooked battle of the American Revolution.

A neglected and disused parking garage ramp has become home street artists to share their art.

One of the largest public collection of historic armored and military vehicles in North America.

A tribute to Samuel Wilson, who may be the original "Uncle Sam."

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

Dedicated to "the father of U.S. life insurance."

The monument is inscribed, "To Sagamore John and those Mystic Indians Whose Bones Lie Here”.

"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."

This location holds the truth to what truly happened that faithful night.

What better place to take a seat?

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

A small plaque promises cold, hard cash in exchange for work by the famous pop artist.

An anonymous art project beneath Longfellow Bridge where hundreds of trophies line the steel support beams.

This plaque is dedicated to one-half of the Magliozzi brothers and their hit radio show, 'Car Talk.'

Plans for this peninsula included houses, the United Nations Headquarters, and a nuclear power plant. When none of them worked out, it became an expansive park.

The last remaining attraction from Paragon Park.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

Friction between grains of sand cause a curious "singing" sound.

An eccentric inventor's castle home with its own indoor weather system.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

The world's largest piece of copyrighted artwork.