Postojna · Things to do

The best plain-English explainer of how karst works, right by the cave entrance. Worth 45 minutes before you go underground.

In summer the natural cave passages behind the castle open, the ones the robber baron used to sneak in supplies under siege.

Beyond the cave tour, a marked loop through the collapsed dolines and the Velika dolina, with almost nobody on it.

A fortified Karst hill village of stone houses, with a garden laid out by Ljubljana's architect Joze Plecnik.

Forty minutes northwest, a valley of Zelen and Pinela grapes grown nowhere else, plus Slovenia's best-known fine dining.