Heathrow is primarily known as London Heathrow Airport (LHR), the busiest and largest international airport in the United Kingdom and Europe. It is not a city in its own right; rather, it is a massive transportation hub located in the London Borough of Hillingdon, roughly 14 miles west of Central London. Covering nearly 5 square miles, it operates as a "city within a city," featuring four passenger terminals, a cargo terminal, its own police force, medical facilities, and even a resident press corps. The name "Heathrow" originally comes from a small hamlet that was cleared in 1944 to make way for the airport's construction. While there is no "City of Heathrow," the area surrounding it is highly developed with dozens of hotels, business parks, and residential neighborhoods that cater specifically to the airport's 75,000+ employees and millions of annual travelers. If you are told to "go to Heathrow," you are going to a terminal building, not a municipal town center. Its immense scale and economic impact make it one of the most recognizable geographic markers in the world.