This site offers students information about the Johnson Space Center and the programs it supports. There are links for student activities and student internships. There is even a link where students can obtain grade-level appropriate information about careers available at NASA.
Here is a collection of paintings by Crockett Johnson (1906-1975) which are dubbed "mathematical paintings" and could be studied in both art and math. The one linked is Archimedes Transversal, but 80 total are included in this online collection.