Old Faithful Geyser

'Many notable people have come to see, hear and learn the mysteries of this "Wonder of Nature" that captivates the imagination – it's amazing!' brags a vintage sign at this geothermal roadside attraction. Scientists do gush about this geyser, which shoots boiling water 30ft to 80ft into the air every 20 to 40 minutes – though brief spurts can be anticlimactic. Make the most of admission with picnics, bocce, geology displays, and a barnyard petting zoo with goats and guard llamas.