More adventurous visitors climb wilder , crumblier sections that are not officially open to the public and stretches near the capital have become popular sites for summer raves .
但有更多大胆游客攀爬位处更荒凉、（墙体）更脆弱，而且未正式对外开放的长城段，至于位置靠近北京的长城段，则已成为最受欢迎的夏日疯狂派对的地点。
crumblier