We have the “wall pops” brand World and USA maps. We ordered them through amazon. They are decals and stick/remove to/from the wall without any issues. They also come with a dry erase marker, which has been a huge hit with my son 
Wall Pops WPE0624 Kids World Dry Erase Map Decal
Wall Pops WPE0623 Kids USA Dry Erase Map Decal