Fort De Russy

Fort DeRussy is a United States military reservation in the Waikiki area of Honolulu, Hawaii, under the jurisdiction of the United States Army. Unfenced and largely open to public traffic, the installation consists mainly of landscaped greenspace. The former Battery Randolph now houses the U.S. Army Museum of Hawaiʻi, which is open to the public. The Hale Koa Hotel, an Armed Forces Recreation Center, and the Daniel K. Inouye Asia-Pacific Center for Security Studies are also located on Fort DeRussy.

Source: Wikipedia