This is a place in the UK called the Mach Loop. It is a spot on the planet where high-speed fighter aircraft can test their skills. Could you imagine doing nearly 900kms’s an hour only slightly above the tree line. 

To me this is beautiful. Its sad that drones are killing amazing aircraft and decades of manned flight evolution. Also at least these planes can fly and do amazing things rather than bomb other countries from 10 thousand miles away. But that’s a whole other topic! 

Enjoy!!