text: They were built at the very beginning of the 16th century by Sultan al-Ghuri , the last Mameluke ruler , and his mausoleum at the heart of the development is now a cultural center hosting regular performances of the Whirling Dervishes ( who achieve religious ecstasy by circling around in continuous motion ) .
  
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  The mausoleum of Sultan al-Ghuri is considered a cultural wonder , attracting many tourists .