Since the semi-eruption of late 2015, it's generally not possible to descend into the calera of Mt. Bromo, which isn't the tallest of Indonesia's many volcanoes but probably its most famous. This drone video by jasonmklean will put you right over the smoking crater. The great volcano has significant cultural significance on Java and is named after the Hindu God Brahma. Since the early 2000's, it's had numerous mini-eruptions, including one in 2004 in which two people were killed by a small explosion.