In 1518, residents of Strasbourg experienced one of history’s strangest events: the Dancing Plague of 1518. It began when a woman started dancing in the street without music or explanation. Within days, others joined her. Soon, dozens — possibly hundreds — were dancing uncontrollably for weeks. Some reportedly collapsed from exhaustion, and a few may have died. City officials, believing the cure was to let it continue, even hired musicians. Historians still debate the cause, with theories ranging from mass hysteria brought on by stress and famine to environmental factors. The true explanation remains uncertain, making it one of history’s most puzzling mysteries.