The Marianas were captured by Japan in 1914 and became a bloody battle ground in World War II between American and Japanese troops. There are still many reminders and war relics all over Saipan including a number of tanks and cannons.
Banadero, a natural limestone cave fortress, was the last holdout for the Japanese during the war. Some caves still have the remains of Japanese troops and some soldiers remained in hiding until as late as 1952 unaware that the war had ended.
Banadero Cave can be explored and views from Laderan Banadero (also known as Suicide Cliff) and Puntan Sabaneta (Banzai Cliff).