"Open into" can be replaced with "lead to", "connect to", "give way to", or "provide access to". All of these synonyms convey the idea of something being revealed or exposed. "Lead to" suggests a path or direction that ends in an open space, while "connect to" implies a direct physical connection. "Give way to" describes a gradual transition from a closed or hidden area to an open one, while "provide access to" implies an intentional opening or gateway. These synonyms can be used interchangeably depending on context, and can add variety and depth to writing and conversation.