Lava Tree State Park

Rising to about 4,205 meters (13,800 feet), Mauna Kea is one of the Big Island’s most spectacular landmarks. The journey up feels almost otherworldly—wide-open lava landscapes, crisp air, and panoramic views that stretch across the island on a clear day.

Near the summit, you’ll spot a cluster of world-class astronomical facilities known as the Mauna Kea Observatories (MKO). The stark terrain and high-elevation setting can look like a scene from the moon. A great place to start is the Onizuka Center for International Astronomy (often called the visitor center), which is open daily and offers exhibits, presentations, and stargazing opportunities at no cost.

Mauna Kea is an inactive volcano and one of the five volcanoes that make up the island of Hawai‘i. It’s also often described as the “world’s tallest mountain” when measured from its base on the ocean floor—taller than Mount Everest by that measurement, even though Everest is higher above sea level.

Many visitors reach Mauna Kea via Saddle Road (Route 200). For driving details and tips, see our guide to Saddle Road. If you’d like to visit with a guide, consider the Mauna Kea Summit & Observatory tour.

Hawaii (Big Island) landmark open: Daily

Location: Mauna Kea, Saddle Road, The Big Island, Hawaii (HI), USA, US