 Wonderland opened on June 12, 1935 and formerly offered 361 races during its 100-day, April to September racing period.As a result of a statewide ban on dog racing which took effect on January 1, 2010, the track offered only simulcast wagering, but completely closed its doors on August 19, 2010.The track laid off the remaining 75-80 workers and closed its doors after Massachusetts governor Deval Patrick vetoed a gaming bill that could have allowed the park to add slot machines.