Inside the White Tower, I was amazed by the weapons and armor used in times gone by. The Bloody Tower showed me its dark history with messages from the prisoners left on the walls.
I try to rewrite the underlined parts to try out every possible versions as the following:
... in ancient times ... with messages left on the walls from the prisoners.
After cogitating and trying out every possible term, I find that the first part in the original is the best and irresplaceable while the second is not so. Your advice? Thanks.