An American man vacationing in Europe hasn't been heard from in weeks. 25-year-old Jonathan Luskin from Wisconsin was on break from his teaching job in Hong Kong. His mother says she last saw him in June, when the family enjoyed a vacation in Europe. She says after she went home to the U.S., Jonathan extended his stay and was headed to Slovenia, where he had plans to hike Triglav National Park. InsideEdition.com's Mara Montalbano (https://twitter.com/MaraMontalbano) has more.