HemisFair Park (and the Tower of Americas) were both finished in 1968 as San Antonio hosted the World's Fair. From the Visit San Antonio website:
"...the parks lushly landscaped areas and dramatic, cascading waterfalls offer a refreshing retreat from city streets. The park houses several historic buildings, a playground, the Institute of Texan Cultures and the Instituto Cultural Mexicano. But one of the park's biggest (literally) highlights is the 750-foot tall Tower of the Americas"
HemisFair Park entrance