You are a fool. Hanuman and his fellows were not monkeys as you say. They were human beings like us, but called Vanar because they lived in Van. It is not a mythology. Even if this sethu is not built by Ram and Hanuman, it does not make a difference, because it is enough that Hindus believe so. There can not be proof of everything. Can anybody prove that the hair kept at Hazrat Bal is of Muhammad?