Artist Brent Christensen, 50, of Alpine, Utah, creates these amazing ice castles from intertwining icicles. Building igloos with his children started as a hobby and has turned into a full-blown profession. It takes roughly two weeks for Christensen to build one of the magnificent ice castles, which can get up to 25-feet high. Two of his ice castles are currently on display in Steamboat Springs, Colo., and at the Mall of America. Take a look at some of his amazing ice castles over the years, and click here to read Christensen’s story.