The iconic rope, called a shimenawa, which hangs above the main hall (rebuilt in 1981) weighs a whopping 5 tons! That's over 11,023 lbs.!
I went to Izumo-taisha with my lovely wife back in 2006. She was my fiance at the time, so maybe there is some truth to the whole 'good luck / happy marriage' thing regarding Izumo-taisha. If you ever visit Japan, it's a wonderful place to visit.