The subreddit interestingasfuck (sorry Mom) is, for my money, one of the best. The content is a curated mix of interesting photos, charts, and video clips featuring cool stuff you either regularly take for granted (like brick paths and the moon) or didn't know existed (like oxidation on the surface of Bismuth). This photo gallery includes pictures of natural phenomena, manmade things, the goings-on inside our own bodies, and tons of other cool shit that might even teach you a thing or two. The universe is pretty amazing. Let's look at it together.
http://www.ranker.com/list/interesting-pictures/robert-wabash,
Fireworks, When the Camera Refocuses During the Explosion
View of Space Shuttle Atlantis from the International Space Station
A Cabinet Carved to Look Like a Digital Glitch.
Grass After a Lightning Strike
What a Liter Bottle of Soda Looks Like Before Compressed Air Is Added
Hitler Had to Cut His Moustache to Fit Into a Gas Mask. This Is How He Looked Before.
Human Vision (Top) vs. Cat Vision (Bottom)
Path-Laying Machine
A Child's Skull Before Losing Baby Teeth.
Cool Idea for a Bridge