Deep Time Walk: "a mobile app that enables anyone, anywhere to experience a walking audio history of the living Earth": https://www.deeptimewalk.org/kit/app/
The idea of the Deep Time Walk is simple but incredibly powerful: When dealing with the vast dimensions of time and space, we are often unable to grasp the magnitude quantitatively, just through studying the numbers. A Deep Time Walk allows us to walk the timeline of the history of the Earth and also universe, and thus for example, on a walk of 4.6km, if we start with the birth of Earth, each one-metre step represents one million years. Read more...