<prompt> Translate the following text to EnglishTangu wakati huo hadi mwaka wa 1812 wakati mvumbuzi mwenye ujasiri kutoka Uswisi John L. Burckhardt alipogundua tena Petra, mji huo ulikuwa umesahaulika kabisa.  <response>: From then until 1812, when the intrepid Swiss explorer John L. Burckhardt rediscovered Petra, it was almost totally forgotten. 