Visiting the Venetsa cave in Bulgaria is one of the most fun and adventurous things I have done in Bulgaria so far! The cave is located close to the town of Belogradchik (so visiting the breath-taking natural phenomenon Belogradchik rocks is a must). Unfortunately, I don’t think any public transport will take you there, but you can definitely go there by car. You pass a couple of villages where there might be no signs to take you to Venetsa cave, so you should have good Internet connection and GPS. Around an hour away from Venetsa cave, you can also visit Magura cave – a really spectacular cave that has preserved drawings dating to around 10 000 years ago!
In general, I highly recommend you spend at least one night in the region – there are many caves as well as going for a walk around Belogradchik rocks takes time. There is a small parking lot (free of charge) around 10-minute walk away from the entrance of Venetsa cave. The cave is usually open from 9 AM to 5 PM (Monday is a day off) and the admission fee is around 6 BGN (students get a discount). Keep in mind that you must enter with a tour guide (provided on place, in Bulgarian language, though, so it is good if you have a Bulgarian friend who can translate for you). Usually, the tour starts every hour (and lasts for about 30-40 minutes) or as soon as the tour of the previous group is over. Keep in mind that around 12 PM the tour guide might be out for a lunch break.
As for the cave itself, I have mentioned that it is quite fun to go there. The reason: At the start of the tour you will receive a helmet and you will pass four big halls in the cave. Narrow tunnels connect some of the halls, so wearing a helmet is a must in order to protect your head. Feeling like Indiana Jones is inevitable! During the tour you will see bats, colorful rock formations (there are lights inside the cave that make the cave look spectacular), semi-precious onyx stones as well as the biggest stalagnate found in Bulgaria! (Note: Stalagnate is the column when a stalactite from the ceiling of a cave and a stalagmite from the floor of a cave meet)
An interesting fact is that the cave was found in 1970 but was open for tourists only in 2015! Also, the name of the cave means “wreath”. According to the tour guide, the area around the cave (if seen from above) looks like a wreath and this is why people named the cave this way.