America’s “best idea” – its national parks – have a lot more to celebrate this year than a centennial. They received a record-breaking number of visitors in 2015 – whooping 307,247,252 recreation visits, according to National Parks Service (NPS) data. This is a 4.9 percent increase over 2014, which held the previous record of 292.8 million. The trend is clear – more and more people head out too explore the wilderness. Amongst the variety of outdoor adventures you can embark on, the reasons to love national parks are endless – they are educational, full of mysteries and provide spiritual inspiration.