Sinabung, a volcano in Sumatra disconcertingly close to Lake Toba, has been erupting spasmodically since September. Above is a time-lapse video of pyroclastic flows there, the same phenomena that destroyed Pompeii and St. Pierre.
You can watch the eruption here during daylight hours in Sumatra. When visibility is good, you probably won’t have to wait long for a pyroclastic flow. See Eruptions and Volcano Café for updates and more information on Sinabung.