The Halemaʻumaʻu Crater, located inside the Kilauea crater, is the park's iconic landmark. This massive crater is approximately 800 meters in diameter and 300 meters deep, constantly emitting steam, and its appearance is particularly breathtaking at night. Visitors can admire the crater from the nearby Kilauea Visitor Center and the Thomas Jagger Museum's observation deck, and learn about volcanic activity and Hawaiian culture. Due to the high altitude, windy conditions, and significant temperature variations, a jacket is recommended even in summer.