Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Travel is undertaken only to three mosques: al-Masjid al-Haram, the Prophet's Mosque, and the mosque of Iliya, i.e. al-Aqsa. And praying in my mosque is dearer to me than praying a thousand prayers in other mosques, except al-Masjid al-Haram."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10264