How many people go to the acropolis every year?

A name of a black rock that you can see through by putting in sunlight? What age is covered? What were the effects of the tributary system in China? Where is the Columbus Library in South Salt Lake located? Did mars ever have oceans? The largest ocean in the worldthe oceanis about times the size of the ocean? Who is fabio what happened to him on a roller coaster? How old is the Bristol suspension bridge? What is a dhrian? What type of stone are the Mayan pyramids made of? How much of the earth surface is covered by water? Where is the Mad River Railroad Museum in Bellevue Ohio located? What was the southernmost Spanish mission? Why do you think the crusaders traveled by both land and sea? Where is conwy castle located? What natural resources are around San Juan Bautista? What is the name of the train that goes through the channel tunnel? How have increased population and pollution affected the region surrounding the Panama Canal? How many hours did it take to build the Eiffel tower? In whose honor was Mount Rushmore was built?