Legoland's Bay Area center to open, with mini Golden Gate, Winchester Mystery House FacebookTwitterEmail Legoland Discovery Center Bay Area will open to the public on May 25.Courtesy of Merlin Entertainments Legoland Discovery Center Bay Area will officially open to the public in May after a year-long delay due to the coronavirus pandemic. Families and children can visit the indoor playground at the Great Mall in Milpitas starting May 25, operator Merlin Entertainments announced Wednesday. The 31,000-square-foot playground will have educational and interactive activities, like an earthquake table, master classes and an Imagination Express train ride. Guests will see some of the Bay Area’s iconic landmarks — like the Golden Gate Bridge and the Winchester Mystery House — made with more than 1.5 million Lego bricks.