Explore Sumatra Medan Bukit Lawang Danau Toba and Pulau Samosir Padang Bukittinggi Danau Maninjau The Mentawai Islands Bandar Lampung Share The reason for the existence of the tourist resort is the Bukit Lawang Bohorok Orang-Utan Rehabilitation Centre (wwww.orangutans-sos.org), founded in 1973 by two Swiss women, Monica Borner and Regina Frey, with the aim of returning captive and orphaned orang-utans into the wild after re-teaching them the art of tree climbing and nest building. The rehabilitation programme was suspended a while ago and though the centre is still open, it is more a tourist attraction than anything else. Visitors are allowed to watch the twice-daily, hour-long feeding sessions that take place on the hill behind the centre. All visitors must have a permit from the PHPA office. All being well, you should see at least one orang-utan during the session, and to witness their gymnastics is to enjoy one of the most memorable experiences in Indonesia.