When Ann Kahn was growing up, her family took the same summer vacation every year — a trip to Yosemite. But things are different for her daughter, Ashley. At 19, Ashley has already set foot on every continent, including Antarctica. And all but one of her journeys abroad were taken without her parents. She started when she was just age 13, visiting Europe with a youth travel group called People to People Student Ambassadors (www.studentambassadors.org).

Full story: chron.com