The first picture is at High Mountain Reserve in Wayne NJ. These trails are more of hiking trails and have lots of rocks so the going is pretty slow. Lots of loose rocky climbs. Probably awesome with a Fattie, but I've handled them on both my hard tail and my Salsa Vaya (albeit with lots of Hikebike on thee vaya)
The second pic is Jungle Habitat in West Milford. These trails are MTB specific and way more fun!