Photo: DXR, CC BY-SA 4.0 Free historic sites in Trondheim
Photo: DXR, CC BY-SA 4.0 
Photo: Leonhard Lenz, CC0 Bakklandet
Free, always
Photo: Elizabeth B. Thomsen, CC BY-SA 2.0 Old Town Bridge
Free, always
Photo: User:Sveter (Please credit as "Petr Šmerkl, Wikipedia" in case you use this outside WMF projects.), CC BY-SA 3.0