📍 Yellowstone NP 📸 Credit: @brianvenghousphoto — Old Faithful is probably one of the best known and most visited attractions in America. It is also the most reliable thermal feature in the world. Scientists believe this may be due to the fact that Old Faithful is not connected to any other thermal features. Old Faithful erupts approximately every 91 minutes after an eruption lasting more than two and a half minutes and 65 minutes after an eruption lasting less than two and a half minutes. Recent research proves that the length of the intervals is increasing due to earthquakes which are affecting subterranean water levels. ✨💦 — 🌲Tag #nationalparkwonders to be featured! 🏔Work with us! [email protected]