Vienna could really do without your belt bags and Hokas. Even in December, when subjects from all over the realm flock to its Christmas markets, standards must be upheld. Don’t even think about taking a selfie with the Vienna Boys’ Choir. Lateness, whether it’s for the Vienna State Opera or your Uber reservation, will not be tolerated. And you really should dress for dinner. (Sequins? Fur? Perfect!)

The building’s original architect was Alfred Keller, a key figure in the Art Nouveau scene.

This time of year, Vienna is almost oppressive in its merriment. Oversize baubles, snowflakes, and hearts hang over every major thoroughfare. At the markets, countless ornaments costing less than $10 are handmade by artisans who spend much of the year painting, felting, and papier-mâché-ing their way to this moment. (The best examples are at the Art Advent market in the shadow of Karlskirche, a Baroque church on the Karlsplatz.)