The Ipao Pillbox I is one of three surviving World War II-era fortifications on Ypao Point, located west of Tumon Bay on the west side of the island of Guam. It is built into the limestone cliff overlooking the beach on the property of the Hilton Hotel, about 17 metres (56 ft) in from the high tide line. Its walls are fashioned out of coral rock and cement, varying in thickness from 1 metre (3.3 ft) to 1.6 metres (5.2 ft).
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