The best time to visit the Yellowstone National Park in the United States is now. It features the Steamboat Geyser, which is the largest active geyser in the world. The eruptions last for almost an entire hour and it erupted for the 24th time this year on Tuesday. The eruptions reach as tall as 300 feet, which is a sight to behold for visitors and researchers. The sight has become a tourist attraction, leaving many spellbound post an eruption. The geyser is facing an 'unusually active' period this year, which makes the place worth a visit.