The fortress at Ehrenbreitstein — a cable car ride high above the city of Koblenz in Germany — was built in the early 19th century, under the auspices of the Prussian rulers. The site as a place of defense, though, goes back to pre-Christian times.
Restaurant Casino — using the older definition of “casino”, meaning outdoor amusement place — is right by the fortress. You have to pay for a cable car ride/admission to be able to go to the east bank of the Rhine. There are lots and lots of tables outside, but also some inside, too. I was very happy to be hosted to be able to experience it!