The Cats Museum is a charmingly absurd little institution in a single room in the old town — a private collection of cat-themed prints, postcards, posters, advertisements, and ephemera assembled over decades. The displays are unapologetically hand-curated, with handwritten labels in several languages.
Kotor has adopted the stray cat as its unofficial mascot — they sleep on every warm wall and accept tribute in the form of dropped sardines from cafe diners — so the museum doubles as a kind of civic shrine. Entry is a few euros, and proceeds go to a local cat welfare charity. Allow half an hour; you will leave smiling.