A secret passage (or hiden passage or a secret tunnel) is a hidden route that is used to travel stealthily. Such passageways may be inside a building leading to a secret room, or be a way of entering (or exiting) somewhere without being seen. Hidden passages are a common feature of fiction, but have also served a variety of purposes throughout history. Hidden rooms have helped people evade capture or carry out illegal, religious, political, or smuggling activities.