Reconnect with your spiritual side and meet other worshippers at Providenzkirche. Quietly reflect outside for a while or find out if you are allowed to join the next service.
You'll soon see why this Heidelberg house of prayer is popular with travelers. If you're looking for more to see and do here, Heidelberg Castle, University of Heidelberg Old Campus, and Church of the Holy Spirit are in the area too. They won't take you very long to reach from Providenzkirche.