The Minoans emerged on Crete around 2100 BCE and established dominance over Crete and the eastern Mediterranean until their culture reached its height around 1500 BCE. They built elaborate palaces like the one at Knossos that featured running water, multiple stories, bathrooms, and gardens but no walls. Sir Arthur Evans began excavating Knossos in 1905 and uncovered its grand staircase and throne room. Minoan society was based around palace centers that collected tribute and traded goods. Their sophisticated culture enjoyed painting, dancing, and unusual sports like bull leaping before it began collapsing around 1450 BCE due possibly to invasion from Mycenaean Greeks or a large volcanic eruption on the island of Thera.