Even though the Phanerozoic Eon (from around 539 million years ago all the way to the present) is a rather small slice of Earth's history, which can be traced back to about 4.5 billion vears ago. It was during this time interval that truly complex life flourished - and it still does - laying the groundwork for a world we are now quite familiar with. This life would diversify adapt to new conditions, and break through boundaries, colonizing many different environments. However, extinctions would not be rare, and some, particularly devastating, would change the biosphere in ways never seen before. It is with this in mind that I invite you, dear reader, to experience the past, now gone, but definitely not forgotten. What do you say? Will you take a peek?