Airports of London Heathrow, more than Paris and Frankfurt combined, and Heathrow is the European terminus for 11 of the 25 busiest north Atlantic routes. The busiest long-haul route in the world is between London (Heathrow and Gatwick) and New York (JFK and Newark), with a total of 3,898,460 passengers travelling between the two cities in 2011. Airports of London The metropolitan area of London, England, United Kingdom is served by six international airports and several smaller airports. Together, they make the busiest airport system in the world by passenger numbers and the second-busiest by aircraft movements. In 2016, the six airports handled
Özkonak Underground City Özkonak Underground City Özkonak Underground City is an ancient city built into the northern slopes of Mt. Idis about 14 km northeast of Avanos in Nevşehir Province, in the Central Anatolia region of Turkey. The city has many strata made up of volcanic granite. Its larger areas are connected to each other by tunnels, and it contains a pipe communication system reaching each of its levels. This feature is unique when compared to the Kaymaklı Underground City and the Derinkuyu Underground City. Each carved room had ventilation provided by further piping when the city was sealed during sieges. The city