Yagodina cave is located in southern Bulgaria close to the border with Greece. And it offers a unique attraction as it is the only cave (at least that I know of) where you can do absolutlely official wedding ceremony.
When I went there for the first time, the guide showed us the chamber in the cave where they do wedding ceremonies and I promised myself that one day I should shoot a wedding there. Shure enough this day came just one your after that.
After the ceremony we had the opportunity to do a photoshoot there with the newlyweds and it was quite challenging due to the low amounth of light here was in the cave, but with some setup of lights I managed it.