There's many Tree of Life web app visualizations out there but this is my absolute favorite, and it's criminally underrated:

http://www.onezoom.org/life/@Eukaryota=304358?vis=spiral#x680,y-44,w1.0191

Try finding humans from this 2-billion-year zoomed out version! Took me some scrolling and zooming, and the photo is a nice Easter egg :P!

I love this because it emphasizes the concestor (common ancestor) notion—you can use this to quickly tell that whales and hippos (closely related, believe it or not) lived ~44 million years ago.

Lovely.