Visit the headquarters of America's manned space program. Space Center Houston, the official visitor center for NASA/JSC, offers live shows and presentations, interactive exhibits, an IMAX® theater, behind-the-scenes tours of Johnson Space Center and more. Open seven days a week; closed Dec. 25 . Twenty miles southeast of downtown Houston, three miles east of I-45 on  NASA Road 1  . 281/244-2100 .

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