Want to take an adventure underground? The Lewis and Clark Caverns State Park is located near Helena, Montana, and  provides visitors with the opportunity to admire limestone caverns. These caverns are some of the largest in the Northwest and contain numerous decorations. Visitors can also enjoy the hiking and biking trails surrounding the cavern, and participate in activities such as canoeing and fishing. For full immersion, the park offers over forty campsites near the caverns, and these can be reserved in advance. There are different tours of the caverns, based on difficulty level. In the winter, get into the holiday spirit with a candlelight cave tour! If you wish to explore the caverns, you must pre-book a guided tour.