The craziest theories have been put forward to explain the famous Nasca lines: astronomical calendar, divine frescoes, extraterrestrial signals... Since 1997, German archaeologist Markus Reindel has been working to put science back into all this. And after almost 20 years of excavation, he has come up with a theory that now seems to have the unanimous support of scientists: the Nasca lines are places of religious celebration.
