Harvard Summer School
Harvard Summer School is a program at Harvard for high school students. Students can earn college credit in Harvard courses (taken alongside college students and adult students).
The program is open to current 10-12th graders.
The cost is $11000 as a residential student, which includes tuition for two 4-credit courses or one 8-credit course.
You can find out more here: http://www.summer.harvard.edu/programs/secondary-school