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Fort Sam Houston (called "Fort Sam" by locals) is located on the northeast side of San Antonio, Texas. It is accessible from Interstate-Loop 410, Interstate-35 and US 281. The post is surrounded by San Antonio, the 10th largest city in the United States. Some interesting places to visit are the Alamo, the Riverwalk, the Missions, the Alamodome, Seaworld of San Antonio and Fiesta Texas Theme Park.