The term ‘old faithful’ is most closely associated with the Yellowstone Park geyser, but it is actually used to describe any geyser that erupts on a regular schedule. Napa Valley's version is a blast! Boiling hot water shoots 60 feet into the crystal blue sky, while spectators gather casually round and gasp every 30 minutes or so. Driving by, you might mistake this for a tourist trap; a little worn down, more than a little tacky from the outside; but rest assured, it really is worth the price of admission. Don't miss the poor little fainting goats on the side, and the fascinating exhibit on geyser eruptions and earthquake predictions. Seek out owner Olga Kolbek; she's a gold mine of fascinating local lore. Admission: $8 adults, $7 seniors (60+), $3 children 6-12; under 6 free.