Postojna cave, Postojnksa Jama

We parked and slept across the road for 20 euros a night. No amenities, just trash bins. Fine for one night, though there was some traffic.

We spent the night at the first campervan site you encounter, which has electricity, water, and a toilet disposal area. It's near the cave entrance. You pay for parking at the kiosk in the large parking lot where you walk to the entrance. €12.50/24h, all-inclusive. Shuttle bus €2 per person, round trip to the castle.

I didn't see anyone dumping anything. Yes, maybe you can dump everything on the street. A lot of unrest at night. People who come at night. A festival nearby, a lot of noise. Arrive here a day in advance. You can exchange your parking ticket for a 1-5 day pass for 25 euros. But do that at the information desk above the entrance to the caves. If you park at a parking garage, you pay the full fare, even if you're a minute over your 24-hour limit. You pay 40, so it's worth it.