Fodor's Expert Review Timpanogos Cave National Monument

Soaring to 11,750 feet, Mount Timpanogos is the centerpiece of a wilderness area of the same name and towers over Timpanogos Cave National Monument along Highway 92 within American Fork Canyon. After a somewhat strenuous hike up the paved 1½-mile trail to the entrance, you can explore three caves connected by two man-made tunnels. Stalactites, stalagmites, and other formations make the three-hour round-trip hike and tour worth the effort. No refreshments are available on the trail or at the cave, and the cave temperature is 45°F throughout the year, so bring water and warm clothes. Although there's some lighting inside the caves, a flashlight will make your explorations more interesting; it will also come in handy if you're heading back down the trail after dusk. These popular tours often sell out; it's a good idea to book online in advance, especially on weekends.