This volcano is said to be one of the top 3 active volcanoes in the world.  It spits boulders the size of cars, and lava flows 24/7. 

When you get close, you can hear its roar.  Outside temperature at the top is about 700° F.  The gases emitted are lethal.  I was there during the rainy season, so the pictures aren't very crisp.

While taking this picture, I was standing in a cooled lava field produced in 1992.