At an amazing 3.571 metres, the Sphinx observatory at Swiss Alps is the highest-altitude construction in Europe. The Sphinx building and observation terrace stand 117 metres above the Jungfraujoch-Top of Europe . On 13 December 2001 UNESCO declared the Jungfrau-Aletsch-Bietschhorn area the first World Heritage site in the Alpine region. The Sphinx Observatory is located on top of a small, separate mountain on Jungfraujoch. The main-part of the Sphinx is used by scientists but tourists may get outside of the building, at a terrace that faces all sides of the building and provide stunning 360° views.