Cave City, Kentucky

If eating a sandwich 267 feet underground intrigues you, explore Mammoth Cave National Park. The world's longest known cave system is home to the Snowball Room, an underground lunch room, and dramatic dripstone, gypsum and helictite formations. View the caverns by only a lantern's glow like the first tourists did in the 1800s with the Violet City Lantern Tour, and see saltpeter production and a subterranean hospital. Experience the Green River — one of two nearby waterways — with a Cave Country Canoe trip, paddling past a cave entrance and several islands. Rest in one of the park's Historic Hotel Cottages then ride a cart down the twists and turns of the Kentucky Action Park's alpine slide. Chase your next adrenaline rush at more than 300 feet in the air on Kentucky's longest twin zip line — soaring over fall foliage — before touching down.