They're off! The trekkers are on their way to Mexico. They left San Francisco on Saturday, August 15.

NEWS: The Team is already in San Diego! Join them as they visit Old Town, explore what Latin culture means to locals, and visit a shelter for homeless youth. Learn all about it in Basecamp.

Coming Saturday: Crossing the Border: An update from Tijuana, and finally- MEXICO CITY!

FIRST TIME HERE? Go to About the Mexico Trek to learn what it's all about.

TEACHERS: Check out the Teachers' Zone for all the background information and lesson plans you'll ever need.

Next update: Wednesday, August 19, 6 p.m. EST.