.
hazrat muavia grave is in damacus and hazrat mufti taqi usmani visited his shrine and has narrated account of his visit in his book “Jahan Deeda”. a special permission from the govt of syria is required to visit his shrine as ppl from a sect wud throw garbage on his grave. and we shud condemn such a obnoxiuos behaviour
as far as yazid grave is concerned it whereabouts is generally considered unknown. however it is said that he was buried in damascus. in a documentery by naheed hadi with the title "safre karbala " a grave is shown that is said to be the grave of hazrat yazid. however its authencity is doubtful.