(Two Harbors, MN)  --  Minnesota's Split Rock Lighthouse is a bigger tourist magnet than ever this summer.  The North Shore landmark turned 100 this year - and special events are drawing visitors from all around the Great Lakes.  Manager Lee Radzak says around 150-thousand people are expected to visit through October, compared with 120-thousand in a normal year.  The lighthouse beacon is lighted the first Friday of every month.  And people are invited to share their photographs of long-ago visits to Split Rock.  The beacon was lighted for the first time on July 31, 1910.