Diamond Head, known as Lēʻahi in Hawaiian, is a volcanic tuff cone on the island of Oʻahu. Its last eruption occurred about 150,000 to 200,000 years ago. Although it is considered an extinct volcano, its iconic shape and historical significance make it a popular tourist destination and a symbol of Hawaii. The crater was formed by a series of explosive eruptions, and today, it offers stunning views and hiking trails for visitors to explore.