Century III Mall; West Mifflin, Pennsylvania

Neatly perched atop a giant slag pile nine miles southeast of downtown Pittsburgh, Century III Mall has an interesting name and an even more interesting history. Opened in 1979, Century III Mall was the result of a mutually beneficial partnership between regional real estate magnate Edward DeBartolo of Youngstown, Ohio, who wanted to build a giant mall, and the U.S. Steel Corporation, who had a giant mountain of slag marring the landscape south of Pittsburgh that needed a better use. For those who don’t know, slag is a by-product of steel production, and for many decades the slag from Pittsburgh’s steel mills was transported to this site until it became an otherworldly artificial mountain taller than anyone could have imagined, disaffectionally known as Brown’s Dump.

Frederick Towne Mall; Frederick, Maryland

An unusual characteristic about Frederick is, despite a relatively small size, it is home to two medium-sized shopping malls. Frederick Towne Mall, located on the “Golden Mile” retail strip of U.S. 40 on the west side of town, was the first mall in town, and opened to massive fanfare in 1972. Francis Scott Key Mall, which opened a few years later in 1978, anchors another retail area on the south side of town adjacent to Interstate 70, which goes east to Baltimore, and Interstate 270, which goes south to Montgomery County and Washington, D.C.