Diamond Head State Monument, Hawaii

Diamond Head State Monument is a 475-acre section of land southeast of Honolulu, Hawaii. It is known for its volcanic crater, historic hiking trail, military history, and coastal views. The crater was formed over 300,000 years ago. The trail to the summit was built in 1908. It was initially made as part of O'ahu's coastal defense system but was turned into a hiking trail many years later. The hike is just under a mile from the trailhead to the summit, but if you hike from outside the park into the interior, you reach a round-trip hike of about 3 miles. The area is beautiful, the hike is short but steep, and the views are incredible.