The Grand Prismatic Spring, aptly named

  • Grand Prismatic Spring prisms the light in its mist
  • Grand Prismatic Spring acts as a prism and rainbows appear in its mist
  • Grand PrismaticSpring

Biscuit Basin -- nice walking trails nearby. YNP has a webcam on Biscuit -- there was an explosion in 2009.

  • Grand Prismatic, sans prism (in the Midway basin)
  • Biscuit Basin
  • Midway Geyser Basin

  • (not sure where -- between Firehole Lake Dr and Fountain Paint pots)
  • Norris geyser basin
  • Norris geyser basin

Norris is said to be very unstable. In July 2013 the Steamboat geyser erupted for the first time in 8 years.