Allow access for unathenticated users to specific page using ASP.Net Forms Authentication

I am using ASP.Net Forms Authentication. My Web.config looks like this.

    <authentication mode="Forms">
      <forms loginUrl="login.aspx"/>
    </authentication>
    <authorization>
      <deny users="?" />
    </authorization>

So currently every aspx page requires authentication.

I want to allow access to even unauthenticated users to a specific page named special.aspx. How can I do this?