Chapelle Notre-Dame du Haut, Ronchamp, France

Designed by Le Corbusier, this little church is "on the way" from Basel to Paris. But with waiting time and time on local trains it took me 10 1/2 hours to visit. Not sure if it was worth it, but at least I got a bit of an architecture fix to make up for not going to the Rietveld Schröder House in Utrecht.