Baltimore Memorial Stadium
This structure stood right in the middle of the biggest city in Maryland. It is the venue for the debut of the ravens, and the Orioles even called it home for a few years (1954-1991). In 2001, the stadium was demolished. It took ten months to turn this hunk of concrete into a pile of rubble. However, it wasn’t a complete waste. The rubble from the demolition was turned into an artificial reef in the Chesapeake Bay.