Mevlana Museum in Konya Turkey, is the Mausoleum of Rumi, a Sufi mystic. Also the dervish lodge of the Mevlevi order known as the Whirling Dervishes.
Under the Stars - Konya. Turkish whirling dervishes of Mevlevi. The way I understand it is that "Dervishes" practice an esoteric form of trance dance in conjunction with their Sufi beliefs that is meant to increase their connectivity to God.