Yerkapı, monumental stairways at Earth or Sphinx Gate located in Hattusa

Monumental stairways at the Earth or Sphinx Gate located in Hattusa. The Earth or Sphinx Gate was originally surrounded by four monumental sphinxes, which are now in museums in İstanbul and Berlin. This gate was built with an artifical mound digged by a 70m-long tunnel. It was built by the Hittites using a corbelled arch (two flat faces of stones leaning towards one another), passing down the stony tunnel and emerging from the postern.135 film (36×24 mm