A Firm Foundation

The property on which Trinity stands—along with the rest of the Back Bay area—is landfill. To keep the stout granite and sandstone building that anchors Copley Square from sinking below the high water table, the church foundation is supported by thousands of vertical wooden pilings. The property on which Trinity stands—along with the rest of the Back Bay area—is landfill. To keep the stout granite and sandstone building that anchors Copley Square from sinking below the high water table, the church foundation is supported by thousands of vertical wooden pilings. (Source: Trinity Church guidebook)