Answer:
Man walks over, and man swims under. In times of war, it can be burned asunder. What is it?
A great mysterious place that the bold have been known to journey into.
You heard me before, yet you hear me again, then I die. Until you call me again.
What is eaten but not grown and was born in water but will disappear if soaked?
What does everyone know how to open but not how to close?
I have two eyes in the front and a lot of eyes on my tail