Some Restricted Areas, for airplanes to fly
Aircrafts do not fly over Antarctica, as windy and snowy conditions of Antarctica causes lack of visibility to the pilots. Also the area called North Pole will never ever have an airplanes flying overhead because there is a magnetic field that keeps on changing yearly. This can lead to chaos as true north might look different to the pilot than what it is actually. Hence navigation willl get difficult.
Pilots will never make a mistake by flying over Tibet, the area that has one of the highest mountains becasue in scenarios like when there is need of oxygen then plane would have to descent but with a huge risk by unforgiving one of the highest peaks in the world.
Mecca is the region that has no airport so it has not seen any aircraft flying in the area.
No aircrafts over the Disney land and Area 51 in Nevada also not over Camp David the place in USA known for confidential meetings for the presidents.
Last but not the least , there will no airplanes flying over Taj Mahal in Agra, India