The volcano is part of the Cabusilan mountain range. It was relatively dormant until one fateful day on June 15, 1991 when it spewed an intense cloud smoke, followed by millions of tons of lahar—a deadly mix of volcanic ash and lava. It destroyed entire towns, leaving desolate villages and displaced people. But 20 years later, the locals are reaping the benefits—from lahar, which is quarried and sold as construction material or turned into handicrafts. Tourism is pretty good too! Mt. Pinatubo is now a world-class hiking destination with a caldera lake!