IMPORTANT VISA INFORMATION: (from Dr. Gokhan Danabasoglu) Citizens from some countries (such as USA) need a visa to enter Turkey. It takes less than 5 minutes to obtain a visa online. The web address is https://www.evisa.gov.tr/en/. It contains all the needed information. The cost is $20 + some minor fee. It may be possible to get the visa upon arrival to Turkey, but the cost goes up to $30.