I couldn't tell you exactly what the custom is, but essentially everyone in Valencia goes to the beach at midnight on the summer solstice and jumps in the water. My friends and I cought wind of this during our couple day excursion from Barcelona and of course had to investigate. For educational purposes. . . Right.

Anyways, I took a variety of pictures. People were burning tons of stuff on the beach, and there were hundreds upon hundreds of people in the water. I liked the way this picture depicted the scene though, so I thought I'd upload it. One estimate placed the number of people along the approximately five miles of beaches at 250,000. I believe it.