Mauna Kea is a dormant volcano with a peak of 4,207.3 m above sea level. Most of the volcano is underwater, and when measured from its underwater base, Mauna Kea is the tallest mountain in the world, measuring 10,211 m. This and its location in Hawaii make it the perfect spot to view the night sky.
The Mauna Kea Observatories (MKO) are a number of independent astronomical research facilities and large telescopes based on the summit. These arent they type of telescopes you can look though and most are unmanned. but the summit offers you a unique opportunity to view the sunset from above the clouds and to look at the night sky with very little light pollution. A trip to Mauna Kea isn't for the feint hearted, its elevation means that you will need to stop half way to acclimatse and many get altitude sickness at the summit. Bit its work this, the view is spectacular!