Start your summer with a trip to Spiro Mounds Archaeological Center for a special guided tour on the summer solstice. On June 21 there will be three walks led by archaeologist Dennis Peterson starting at 11 a.m., 2 p.m., and 7 p.m. Each walk will include one mile of easy walking on paved trails and last about two hours. There is a fee of $5 per adult and $3 per child this event; cash or check only, please. Due to…