We take you on a journey to #Peru's famed Inca citadel, #MachuPicchu. Perched at an altitude of 2,430 metres, this UNESCO World Heritage site still holds many secrets. Some of them were recently uncovered by #archaeologist José Bastante and a team of Polish researchers. They found a system of underground aqueducts, as well as other fascinating structures. Our France 2 colleagues report, with FRANCE 24's Monte Francis.