Mauna Kea is a dormant volcano located on the Big Island of Hawaii. It stands at 13,796 feet (4,205 meters) above sea level, making it the tallest mountain in the world when measured from its base on the ocean floor. The summit is known for its clear skies and is home to several astronomical observatories, which take advantage of the high altitude and low light pollution. The mountain is also significant in Hawaiian culture, considered sacred by many native Hawaiians. Its diverse ecosystems range from tropical forests to alpine deserts, supporting unique flora and fauna. Mauna Kea is a popular destination for hiking and stargazing, attracting visitors from around the globe.