▁its ▁skin ▁of ▁co pper ▁pl ates ▁is ▁cleaner ▁now ▁than ▁before ▁due ▁to ▁cleaner ▁sk ies ▁and ▁the ▁effects ▁of ▁centuries - worth ▁of ▁rain ▁r ins ing ▁away ▁the ▁statue ' s ▁ver dig ris ▁pat ina . ▁ ▁Th ick ▁for ests ▁of ▁trees ▁over ▁ 9 0 ▁feet ▁tall ▁completely ▁cover ▁the ▁eastern ▁half ▁of ▁North ▁America . ▁Human ▁structures ▁still ▁surv ive ▁under ▁forest ▁hum us . ▁From ▁time ▁to ▁time , ▁ra ins ▁and ▁rivers ▁was h ▁away ▁hum us , ▁un cover ing ▁concrete ▁be ams , ▁pl ast ics , ▁cell ph ones ▁and ▁st ain less ▁steel ▁objects . ▁T ens ▁of ▁millions ▁of ▁rein de er , ▁b ison , ▁cattle ▁and ▁horses ▁make ▁up ▁gig antic ▁her ds ▁in ▁the ▁Western ▁North ▁American ▁pla ins . ▁The ▁Great ▁S ph inx ▁of ▁G iza ▁is ▁buried ▁again ▁in ▁the ▁s ands ▁of ▁the ▁Sah ara ▁where ▁it ▁will ▁remain ▁well - pres erved , ▁just ▁as ▁it ▁had ▁done ▁for ▁thousands ▁of ▁years ▁before ▁it ▁was ▁redis cover ed ▁for ▁the ▁first ▁time . ▁ ▁( 5 0 0 ▁years ▁A . H .) ▁For ests ▁return ▁to ▁the ▁state ▁they ▁had ▁ 1 0 , 0 0 0 ▁years ▁ago . ▁ ▁( 1 , 0 0 0 ▁years ▁A . H .) ▁The ▁E iff el ▁Tower ▁has ▁lost ▁all ▁but ▁its ▁four ▁legs . ▁The ▁rest ▁of ▁it ▁has ▁fallen ▁down ▁and ▁been ▁covered ▁by ▁soil ▁and ▁veget ation