1. Grand Prismatic Spring is the largest hot spring in North America and the third largest in the world. It is located in the Midway Geyser Basin of the Yellowstone National Park, Wyoming. The spring has a diameter of approximately 250 feet and a depth of 160 feet. The unique and vibrant color of the spring is due to the presence of bacteria which inhabit the water. The colors change as the temperature of the water changes. The spring is surrounded by a boardwalk, which offers a stunning view of the different colors of the water.

2. The Grand Prismatic Spring is open year-round, but the best time to visit is during the summer months. The operating hours may vary depending on the season, so it is recommended to check the official website or call (307) 344-7381 for current information.

3. Admission to the Yellowstone National Park is required to visit Grand Prismatic Spring. The park offers different ticket options, including single-entry, seven-day pass, and annual pass. The current prices are $35 for a single-entry vehicle pass, $70 for a seven-day pass, and $80 for an annual pass. There are several transportation options available to reach the spring, including private vehicle, shuttle bus, and guided tours.