People visit the Palace of Knossos in Heraklion, Greece, on May 23, 2018. Knossos is an archaeological site in Crete where the Minoan civilization flourished from about 2,600 to 1,100 BC. (Xinhua/Stefanos Rapanis)

People visit the Palace of Knossos in Heraklion, Greece, on May 23, 2018. Knossos is an archaeological site in Crete where the Minoan civilization flourished from about 2,600 to 1,100 BC. (Xinhua/Stefanos Rapanis)

People take selfies in the Palace of Knossos in Heraklion, Greece, on May 23, 2018. Knossos is an archaeological site in Crete where the Minoan civilization flourished from about 2,600 to 1,100 BC. (Xinhua/Stefanos Rapanis)

People visit the Palace of Knossos in Heraklion, Greece, on May 23, 2018. Knossos is an archaeological site in Crete where the Minoan civilization flourished from about 2,600 to 1,100 BC. (Xinhua/Stefanos Rapanis)