An F-15 Strike Eagle low level flying in between canyon walls.
Filmed from the cockpit, the video lets you appreciate an in-cockpit experience thanks to the original sound. Obviously, if you were actually flying the F-15E, you would not hear that background noise you can hear in the video: it would be almost completely cancelled inside your HGU-55P flight helmet.
In the age of stealth bombers, standoff weapons, drones, cyberwar, electronic warfare, etc. low-level high-speed flying is still one of the most important parts of both planes and helicopters combat pilot training: pulling some Gs during aggressive low level turns needed to avoid obstacles and take advantage of terrain masking is a good way to improve handling skills as well as increase survivability (for instance, preventing detection by enemy radar systems.)
H/T to Matt Fanning for the link to the video!