Traditionally, Slovenians eat “Aleluja,” a “fasting dish” made of turnip peels on Good Friday. This is done to remember a famine that once affected the Slovenian town of Carniola in the 16th Century.

You’ll slowly climb up the mountains and back down from the Upper Carniola region to the Trenta Valley. Along the scenic route, which is closed in winter, you’ll find numerous places to pull ...