Apparently in Nara, they burn down all the grass on Mt. Wakakusa once a year. From Mainichi:
About 130,000 spectators were enchanted to watch the annual grass burning on Mount Wakakusa here on Sunday night.
Officials in Nara set off some 200 fireworks at about 6 p.m., and then set fire to dead grass remaining on the face of Mount Wakakusa.
Check out that picture! I’d like to go see this someday.