Over the last few decades, South Portland has become the retail capital of Maine. The Mill Creek shopping center, built in the 1950s, was the first such "strip mall" built in Maine: a line of stores under one long roof and a covered walkway. Mill Creek has changed and grown significantly since, but the original layout still forms the core of the stores. The area in Mill Creek known as the Waterfront Market sits at the base of the Casco Bay Bridge and attracts shoppers from Scarborough, Cape Elizabeth and Portland.