Ankara is the capital city of Turkey. It hosts buildings of various governmental institutions along with the The Grand National Assembly of Turkey and many university campuses, one of which is the campus of METU.
The best way to travel to the campus after arriving at Ankara Esenboğa Airport is to take the shuttle service from the airport to the main bus terminal (AŞTİ) in the city centre. You can take a metered taxi from AŞTİ to METU Campus (ODTU in Turkish).
Please see https://maps.google.com/ for information on how to get from the airport to the city centre. Further information on travelling to and from campus may be found at http://www.metu.edu.tr/transportation The map and campus plan of Middle East Technical University may be found here: http://www.metu.edu.tr/location-campus-map