Worlds Greatest...

Here is a list of things you'd never thought about:

1. Worlds Best Subways

2. World's Dirtiest Lake and Rivers - It's actually very sad to see how humans contaminate the world we live in. Greed and ignorance both hurt Mother Nature so deeply. These pictures speak a thousand words. See how we tear our Mother apart, slowly and surely.

3. From Earth to Moon: Man's Beginning to Space Travel - This is where it all began!

...Earth

A few months before reaching the ultimate goal of putting someone on the moon, the crew of Apollo 8 changed how humans see their planet forever. On December 24, 1968, astronaut William Anders took the famous Earthrise photo. NASA wrote:

"For the first time in history, humankind looked at Earth and saw not a jigsaw puzzle of states and countries on an uninspiring flat map – but rather a whole planet uninterrupted by boundaries, a fragile sphere of dazzling beauty floating alone in a dangerous void. There was a home worthy of careful stewardship."

The late nature photographer Galen Rowell described this photo as "the most influential environmental photograph ever taken."