The karst cave at Postojna, one of the largest in the world, is among Slovenia’s most popular attractions and its stalagmite and stalactite formations are unequalled anywhere. It's a busy destination – the amazing thing is how the large crowds at the entrance seem to get swallowed whole by the size of the cave, and the tourist activity doesn't detract from the wonder.
The impact of Lipica, some 9km southwest of Divača and 2km from the Italian border, has been far greater than its size would suggest. This tiny village lives for and on its white Lipizzaner horses, which were first bred here for the Spanish Riding School in Vienna in the late 16th century.
The Romanesque church in the tiny Karst village of Hrastovlje (population 139) is small, surrounded by medieval walls with corner towers, and covered inside with extraordinary 15th-century frescoes, including the famous Dance of Death. This is the reason to make the trip here – as difficult as it can be.