这里面是一个固定搭配问题,因为escape 需要与from搭配,表示“从……逃脱”.
where本身一般等于at which; on which; in which表示“在哪里”,只是表示一个状态.如果想要表示一个动作,或者表达其他特定的位置,就需要用：介词+which
更多例句：The door out of which the tiger escaped is broken.
I sat under the tree on top of which there was a bird nest.