The Northern Mariana Islands has many WW2 bunkers, which fall under the National Park Service as "War in the Pacific" parks.
There are also memorials on the northern end of Saipan to the Japanese soldiers and civilians who feared capture by US forces and committed suicide by jumping from the cliffs into the ocean.
The Marianas' top activity among Americans is scuba diving and snorkeling. In additional to the coral reefs you might expect, the waters around the islands were the scene of fierce fighting during World War II and there are many ship wrecks and even rusting tanks stuck on the seabed.
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