In the 1950's, the Communist Chinese army entered Tibet and enforced widespread institutional change. The Cultural Revolution subsequently caused widespread cultural havoc in Tibet and China. Many Tibetan spiritual leaders and lineage heads found the atmosphere in Tibet no longer conducive to lineage practice, and were in that way forced to leave Tibet. The most recent prominent example of such flight is that of the Seventeenth Karmapa. Tibetan Buddhism is still widely practiced in Tibet, but now is also found in countries throughout the world.