La Alhambra

ask user to change the rating

It's free, which does mean something. However, 1. The audio is just a computerized voice reading text that resembles a Wikipedia entry. 2. The audio won't keep playing in the background, it only plays while _the screen is on_, so if you turn the screen down from or let the phone sleep the audio stops. The background music behind the computerized voice is nice though, it does add to the ambiance. My recommendation, skip this and just pay for the official app.