From wikipedia :

>AllTrails (www.alltrails.com) is a fitness and travel mobile app used in outdoor recreational activities. This app is commonly used for outdoor activities such as hiking, mountain biking, climbing and snow sports. The service allows users to access a database of trail maps, which includes crowdsourced reviews and images. Depending on a user's subscription status, these resources can be used online and offline.

Project page : https://www.redantler.com/work/alltrails

>The outside is in all of us, but the outdoorsy world of hiking boots and mountain peaks can be intimidating. As an app built and curated by the community, AllTrails helps people plan, live, and share their next outdoor adventure — whether that’s a hike up a mountain or a stroll around the neighborhood. Our brand system leverages a path framing outside stories big and small along with inclusive imagery to awaken the outside people in all of us.