Octoberfest beer tasting along the paved lighted trails INSIDE the Cave, an evening hayride and live bluegrass music, tasty snacks and cash bar in our historic barn. Cave After Dark is a NEW series of themed events for adults 21 and older at Cave of the Mounds – National Natural Landmark. Each event includes a unique at-your-own-pace in-cave experience and theme-related reception in our Visitor Center with cash bar. These special events sell out fast, so reservations are required.