How many people go to the acropolis every year?

What dunes look like? When did tourism begin? What year was carbon discovered in? Which states in the northeast region that do not borber the Atlantic Ocean? When was Mississippi declared a state? Is lake baikal deeper than Lake Superior? Were there any setbacks to building the Panama Canal? Which is the first tastiest river water in the world? Is the Sahara Desert good for the economy or bad? Where is the Stone Fort Museum in Nacogdoches Texas located? What is the big net called to catch fish in an ocean? What Henry Clay's American System included federal subsidies for projects such as the Erie Canal and National Road in order to bind which sections of the country together? What distinguishes rainforest from temperates forests? What do these organisms get by living near the surface that they cannot get in deep water? What goods were produced at mission san Diego de alcala? What lady liberty holds beside her golden door? Are there suicide barriers on the Chesapeake Bay Bridge? How much does it takes to run the Lincoln Memorial in Washington DC? Which river system carries more fresh water than any river system on earth? Why civilization did took place near river valleys?