It could have been an alien unexplored planet if I would not have known any better. 
Flying high up in the Earth's atmosphere, the views are sometimes surreal under the right conditions. Endless shades of blue and white and unfolding landscapes that strech on indefinitely. 

Views like these are one of the perks of flying all over the world, around the clock and across the continents. 
The ever-changing weather systems, the deepest oceans and nameless mountains passing down below, it's never mundane. 

This shot is taken from an altitude of 34.000ft, somewhere over a cloudy Romania.