In a disused hangar in Istanbul, Turkish artist Ahmet Gunestekin used thousands of metal human skulls and twisting, spiky animal horns to re-tell some ancient myths in a towering, fearsome installation. The structure, which took 4.5 years and 1 million US dollars to create, was inspired by Gobeklitepe, a 12,000 year-old temple in Turkey that this year became a UNESCO World Heritage site.