Photo of the Day: Mt. Kilamanjaro is the highest free-standing mountain in the world. Most everyone who has summited the Uhuru Peak has left their thoughts in a book stored in a wooden box at the top. Up for the challenge? Tag a friend who would climb all 20,000 feet with you. . . . #PTOD #photooftheday #picoftheday #kilamanjaro #mountain #hike #africa #hiking #optoutside #uhuru #extremesports #outdoorsports #climbing #mountaineering #landscape #landscapephotography #nature #naturephotography #fridayfeeling #inspiration #travel #travelphotography #destination