In the desert of Mexico, two foreign exchange students(one from China, one from the Netherlands) take photographs at the border fence built on the Mexico/US boundary near Agua Prieta Mexico and Douglas, Arizona. The newly built fence is part of the project to secure the nearly 2,000 mile border - which is widely considered the most frequently traveled international border in the world, with an estimated 250 legal and 500 million illegal crossings every year. Neither men did not attempt to cross.