Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

The last remaining 19th-century tenement from Boston's old West End neighborhood.

A centuries-old church stands as a testament to Boston's "father of architecture."

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

These whimsical works of art tell the story of the city's past and present.

Ice cream stand, snack bar, and time capsule of milk conveyance.

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

This 15-foot tall obelisk commemorating the Philadelphia-Baltimore railroad connection sat neglected for over a century.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Alexander Hamilton’s creation caused quite a bit of controversy.

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.