Basel Minster
Basler Münster47°33′ N 7°36′ E
Basel Minster suits anyone at the Münsterplatz market who wants a warm half hour inside a Romanesque and Gothic cathedral, and its trade-off is short winter hours. In Advent it opens on weekdays until 18:00, and it closes to visitors on 24 December.
Photo Oleksandr Dede · Wikimedia Commons · CC BY-SA 4.0 and others, credited in the gallery
The red sandstone Minster forms the backdrop to the Münsterplatz half of the Basel Christmas market. In Advent it stays open on weekdays until 18:00, longer than in the rest of winter, and on Saturdays at 17:00 the Bach um 5 series plays music by and around Bach. The Minster is a Reformed parish church and holds its Sunday service at 10:00, so visitors come in after it ends.

Quick answers about Basel Minster
Is Basel Minster open on Christmas Eve?
No. Basel Minster closes to visitors on 24 December, and also on 1 January and Good Friday.