<prompt> Translate the following text to EnglishStupa zilikuwa mahali pa kuzikia, lakini baadaye zikawa mahali pa kuzikia kwa mawe yaliyofunikwa kwa plasta, na ndani yake kulikuwa na masanduku ya maiti ya Buddha.  <response>: Stupas were originally burial mounds; Buddhists developed them into shrines of plaster-covered stone, inside which are caskets containing relics of Buddha. 