DENVER, Colorado, June 28 -- The History Colorado issued the following news release: With the Summer Solstice in the rearview, many Coloradans are looking forward to summer vacations across the state and History Colorado is happy to highlight how its 11 museums and historic sites - each conveniently located within an hour of a National Park or historic railroad - are the perfect addition to any summer road trip! So whether you are hitting the road for wildflower viewings, trail-hoppings, or con  more