The Crater Rings are adjacent, symmetrical volcanic pit craters in the Western Snake River Plain about eight miles northwest of Mountain Home, Idaho. The craters are at the summit of a broad shield volcano. The eastern crater is about 3000 feet across and 350 feet deep. According to Wikipedia, the western is 2500 feet across and 300 feet deep.
Although the Crater Rings are a phenomenal natural feature, many people in the area do not know about them. Crater Rings are rare enough that this area was designated a National Natural Landmark in 1980, but no signs lead to them. They are not visible from any major roads. They are well worth the visit!
The trail to the craters is not long, and getting to them is not particularly difficult. However, if you want to drive the trails around the craters, good tires and clearance are needed, as the trails are often covered with jagged, pointy lava rocks. The area around the craters is laced with side trails worthy of exploration.
Dispersed camping is allowed in the area, but no obvious campsites are along the trail.