Using professional connections partner up with a peer teacher's class, preferably not in the same state (or at least immediate area). Schedule a time for your classes to Skype with one another. Prepare students and have them become detectives. Students should have questions that are generic in nature, need a yes, no or short answer that will eventually help them determine "Where in the World is that Classroom?"
Alternatives to Skype include Facetime or Google Hangout.