Stan Lee woud say: "Excelsior! Upward and onward to greater glory!” John Muir said: “Near the Prismatic Spring is the great Excelsior Geyser, which is said to throw a column of boiling water 60 to 70 feet in diameter to a height of from 50 to 300 feet, at irregular periods. This is the greatest of all the geysers yet discovered anywhere.” In Muir's opinion Excelsior was incomparable. There was nothing in the world that could match it. Excelsior surpassed even the Great Geyser of southwestern Iceland, the spring whose real name (Geysir) inspired the name “geyser” in the first place.