Source: http://www.engadget.com/2013/11/04/google-plus-connected-classrooms/
Field trips are usually restricted to points of interest that can be easily reached by bus during regular school hours. Now, Google has a tool for enabling virtual visits to educational stops near and far via Hangouts. The folks in Mountain View have launched Connected Classrooms through Google+: a project that brings destinations students may never have the chance to experience in real life within reach inside their classrooms. Trips to the Seattle Aquarium, Minnesota Zoo and Solar Impulse hangar are the first three stops for the program, and soon enough, teachers will be able sign up for virtual tours with over 20 partners. There's also the ability to collaborate with fellow educators and access content all within the confines for Google+. For a glimpse at the potential, head on past the break for a quick video teaser.
Source: Google+ Blog