Rome wasn’t built in a day, and neither was the Boston Convention and Exhibition Center on Summer Street. The ball got rolling in 1997 with the acquisition by eminent domain of some 60 acres of land in the Seaport. When this June 29, 1999 photo was taken,  former Boston Mayor Thomas Menino, left, and then-Massachusetts Gov. Paul Cellucci, right, used sledge hammers to demolish an old loading dock there, signaling the first step in construction the BCEC. It opened its doors in June 2004.(AP Photo/Gail Oskin)