Top Wyoming Underground Tours

This isn't an entrance ticket. Check opening hours before your visit. Witness the power of Old Faithful and explore the surrounding geyser basin with this self-guided walking tour! As one of the most densely-packed geyser regions in the park, there’s no shortage of explosive wonders on display here. Watch huge geysers like Old Faithful, Castle Geyser, and Grand Geyser erupt. Stroll past smaller, bubbling pools. Find out how geysers form and work, and uncover the hidden systems underlying the whole basin. This walking tour makes for the perfect addition to any Yellowstone visit! After booking, check your email/text to download the separate Audio Tour Guide App by Action while connected to WiFi or mobile data. Enter the password, download the tour, and enjoy it offline. Follow the audio instructions and route from the designated starting point. New, Lifetime access, no expiry. Use it anytime, on any trip, as many times as you want.