Superiority of Offering Prayer At Makkah & Madinah

Translation of Sahih Bukhari, Book 21:
Volume 2, Book 21, Number 281:

Narrated Quza'a:
I heard Abu Said saying four words. He said, "I heard the Prophet (saying the following narrative)." He had participated in twelve holy battles with the Prophet.
Narrated Abu Huraira: The Prophet said, "Do not set out on a journey except for three Mosques i.e. Al-Masjid-AI-Haram, the Mosque of Allah's Apostle , and the Mosque of Al-Aqsa, (Mosque of Jerusalem)."

 In another Hadith, the Prophet (sws) is reported to have said:

One prayer in my mosque is better than one thousand prayers in any other mosque excepting al-Masjid al-Haram. (Bukhari: No. 1116)