The London International Youth Science Forum

The London International Youth Science Forum
Annually 350 students attend from over 60 countries worldwide and they attend in a variety of different ways, many as winners of international science competitions, as individuals or a small group, with scholarships from educational bodies, schools and colleges or funding from charitable Foundations to represent their country at this international meeting.

http://www.liysf.org.uk/liysf-participation-booking

Youth for work Interships and Jobs

Interships and Jobs
http://www.youth4work.com/projects/

Anasazi Foundation

The ANASAZI Outdoor Behavioral Healthcare Program is designed for youth 12-17 years old who are struggling with substance abuse, emotional, or behavioral concerns. Participants (YoungWalkers) spend a minimum of 42 days in the wilderness of Arizona hiking and camping with little manufactured gear. They live a primitive lifestyle and learn the skills and technologies of the "ancient ones."
http://www.anasazi.org/youth.html