Altdorf, Switzerland is famous for being the birthplace of William Tell. You can see the statue of him and his son in the center of the square. And the tram off to the right seems to stop right in front of a brewery - how convenient! Unfortunately, I can't tell you anything else about the tram. I think it's still there, but I'm not sure.
Here's the back of the card.
Klösterli, Switzerland reads:
Arrived safely in Schatzdorf and received card. Olivia Sprüngli sends many friendly greetings. Extra greetings to Mr. Brinckmann and St. Johannsberi and of course greetings from Elise.