What is a 3D Matterport Tour / Virtual Tour?

"A Matterport Space is a complete, three-dimensional representation of a real-world location created from 2D (RGB) imagery and 3D data from the Matterport Pro or Pro2 3D Camera. A Matterport Space can be navigated on a desktop or mobile web browser, and in virtual reality through a Samsung Gear VR, Google Cardboard, or Google Daydream.

Combined with seamless hosting and our web player called 3D Showcase, Matterport Spaces create a complete 3D media ecosystem for businesses to leverage 3D models of real places for many purposes — property marketing, construction, facilities management, and news/entertainment."

Courtsey of Matterport 

Please see some examples here.