Airports of London cannot be expanded due to the docks on either side. It is also the only airport serving London which does not operate at night. A light rail service from London City Airport DLR station, which adjoins the terminal building of London City Airport, links it to the financial district of the City of London at Bank and Monument stations, which offer interchanges with London Underground. Located in the London Borough of Hillingdon, Heathrow is by far the largest of London's airports and considered the main gateway into the United Kingdom for non-European visitors. Heathrow has four terminals and two parallel
Aydıntepe underground city Aydıntepe underground city The Aydıntepe underground city () is an ancient underground city in Aydıntepe district of Bayburt Province, Turkey. It is located northwest of Bayburt beneath a residential area. Discovered by coincidence during excavation works for a building construction in 1988, -to some sources in 1998– the underground city at Aydıntepe features chambers, halls and hallways carved out of volcanic tufa rock formation without using building materials. It is situated under the surface. The chambers and the halls are connected with -wide and -high hallways stretching over about in length. There are eight conical shafts over the hallways, which