The Hassan Bek Mosque , , also known as the Hasan Bey Mosque , is considered to be one of the most well-known mosques . It is found in Jaffa , which is now part of the Tel Aviv-Yafo municipality , in Israel . The Hassan Bek Mosque , , also known as the Hasan Bey Mosque , is considered to be one of the most well-known mosques located in Jaffa , which is now part of the Tel Aviv-Yafo municipality in Israel .