The recent freeze overtaking New England has a genuine upside: it’s allowed the Ice Castles in New Hampshire to open almost a full week earlier than expected.

The North Woodstock winter attraction, in its 11th season this year, includes slides, caverns, tunnels, crawl spaces and sculptures all made from ice. About 20 artists grow and harvest icicles, then hand-place them one-by-one to create the hulking, 25-foot-tall LED-embedded castles.