A museum in New York City dedicated to math! The web site also has an online gift shop with math related books, videos and gifts for people who love math.
This web page has 100s of links to math resources.
Epsilon Camp is a residential camp serving promising young mathematicians and their families through an intensive student program and parent workshop. This program is for children who are passionate about math as well as very competent.
MathPath is a mathematics enrichment summer program for students ages 11-14. It is four weeks long, and moves to a different location each year. MathPath is visited by world-renowned mathematicians such as John H. Conway and Francis Su. It was probably the original, and is still one of the few, international residential high-end summer camps exclusively for mathematics and exclusively for students of middle school age.
Mathcamp is an intensive 5-week-long summer program for mathematically talented high school students. More than just a summer camp, Mathcamp is a vibrant community, made up of a wide variety of people who share a common love of learning and passion for mathematics. At Mathcamp, students can explore undergraduate and even graduate-level topics while building problem-solving skills that will help them in any field they choose to study.