Photo: Suicasmo, CC BY-SA 4.0 Free historic sites in Luxembourg City
Photo: Suicasmo, CC BY-SA 4.0 
Photo: Antonin Mercié, CC BY-SA 3.0 Place Guillaume II
Free, always
Photo: Michał Jaroszczyk, CC BY 3.0 Notre-Dame Cathedral Luxembourg
Free, always
Photo: Berthold Werner, CC BY-SA 4.0 Grand Ducal Palace exterior
Free outside, paid inside
Photo: Denise Hastert, CC BY-SA 4.0 Adolphe Bridge
Free, alwaysGëlle Fra
Free, alwaysClausen
Free, alwaysPlace d’Armes
Free, always
Photo: Diego Delso, CC BY-SA 4.0