Lake Erie contains an artificial reef made from the pieces of which sports stadium demolished in 1996?

Cleveland Municipal Stadium, commonly known as Municipal Stadium or Lakefront Stadium, was a multi-purpose stadium located in Cleveland, Ohio. It was one of the early multi-purpose stadiums, built to accommodate both baseball and football. The stadium opened in 1931 and is best known as the long-time home of the Cleveland Indians of Major League Baseball, from 1932 to 1993, and the Cleveland Browns of the National Football League (NFL), from 1946 to 1995, in addition to hosting other teams, sports, and being a regular concert venue.

Through most of its tenure as a baseball facility, the stadium was the largest in Major League Baseball by seating capacity, seating over 78,000 initially and over 74,000 in its final years. For football, the stadium seated approximately 80,000 people, ranking as one of the larger seating capacities in the NFL.

Former Cleveland Browns owner Art Modell took over control of the stadium from the city in the 1970's and while his organization made improvements to the facility, it continued to decline. The Browns played their final game at the stadium in December 1995. Cleveland Stadium was demolished in 1996 to make way for FirstEnergy Stadium, which opened in 1999. Much of the debris from the demolition was placed in Lake Erie to create an artificial reef.