Nobody knows what's in it, but we'll find out in less than two weeks! A safe, that's possibly more than 150 years old, is set to be opened at long last at the Museum of Colorado Prisons in Caon City. It's all part of the celebration for Colorado's 150th birthday. The museum says a locksmith was able to crack the lock, and they'll do the live reveal on July 14 at noon.How the safe got there is a mystery. Stacey Cline, the museum's administrator, …