On the north end of the Newberry National Volcanic Monument, the Lava Butte area has several large basalt lava flows as well as the 500-foot Lava Butte cinder cone—a coal-black, symmetrical mound thrust from the depths 7,000 years ago. The cone is now home to the Lava Lands Visitor Center, which features a variety of interpretive exhibits covering the volcanic and early human history of the area. Lava River Cave is a 1-mile-long lava tube, formed when molten lava drained from the channel, leaving a crust as a roof. Allow about 90 minutes to explore on your own. Lantern rental is $5. Enter by the tiny visitor center.