Google World Wonders Project - Goodle has made 3D maps of World Heritage Sites so you can take a "virtual" tour of all of these - you can search by theme - castles, wonders of nature, location - North America, Asis, etc and there is an EDUCATION tab for teachers with lesson plans - very cool!!
Gettysburg Virtual Tour Designed for visitors to Gettysburg, the Gettysburg Battle app can be used as a virtual tour of the Civil War battlefield. It includes video, audio, and an abundance of information on notable sites at Gettysburg. Try out these other virtual field trips: Monet paintings, art museum, panoramic views, Check out my bundle of Common Core aligned Social Studies iPad lesson plans! *this app is made for an iPhone but works great on an iPad or iPod Touch