Google Expeditions is an education oriented app that is meant to be used in a classroom environment. However, it can be used just about anywhere that you want.
Get up close with historical landmarks, dive underwater with sharks, even visit outer space! The app has over 200 expeditions that you can immerse yourself in. You’ll be able to check out various destinations, landmarks, landforms, waterscapes, and tons of other places. There is a 360-degree mode that works without Cardboard if you need it to and the app is fairly easy to use. It’s also completely free, which is nice.