GORP.com describes themselves as a “Comprehensive resource for adventure travel, outdoor sports and gear, national parks, and more.” They provide a lot of information about accessibility in national parks and forests.
Although Gorp.com still has a Facebook page, the links to their website and descriptions of outdoor areas are not working as of summer 2017.
Category: National parks
National Parks: Accessible to Everyone
“National Parks: Accessible to Everyone” is an official website that addresses accessibility.