NewsSportsEntertainmentLifestyleOpinionUSA TODAYObituariesE-EditionLegals Early Cambridge buildings remain intact underground Preservation is key, as the underground storefronts are believed to be one of only three sets in the country Underneath Ellie's Cottage, at 653 Wheeling Ave., is a hidden gem of Cambridge history. Those who have had the opportunity to step through the white door in the back of Ellie's, have experienced walking down a narrow flight of steps that led them back in time. At the bottom of those steps are the original storefronts built sometime around the 1840s. The still-intact buildings and sidewalks, which have come to be known as Cambridge Underground, were discovered during the Wheeling Avenue construction/streetscape project in 2011.