Field trips are expensive and time-consuming to plan, however that doesn't mean that students can't explore the world outside their classroom. Google Earth is a free tool that can be used for just this sort of purpose. You can create your own trip or scavenger hunt to align with whatever you happen to be studying in the classroom. You can check out my Google Earth trip over the novel Esperanza Rising below.
Google Earth Trip for Esperanza Rising
Google Earth Trip for Esperanza Rising