Rozhen NAO is the largest active scientific astrophysics complex in Southeast Europe. It is located at 1,750 m a.s.l. at Rozhen peak in the Rhodopes. It is 15 km from Chepelare. The observatory is equipped with 6 telescopes. It offers a Visitors’centre with a 18-cm demonstration telescope, a lecturing hall and a museum exhibition. The mirros of the big telescope is 2 m in diameter and weighs 80 t. Night observings with lectures of professional astronomers can be also arranged on request.