Dillon’s popular Ice Castles will return this Friday, bringing with them 40-foot towers, slides, tunnels and igloos. Tickets for the castles went on sale Wednesday. General admission costs $15.95 on weekdays, $18.95 on weekends. Children cost $10.95 on weekdays, $14.95 on weekends. The Ice Castles are open Thursday through Monday. Tens of thousands of visitors checked out the Ice Castles in 2017, bringing $3 million to the local economy, according to Ice Castles LLC.