Quds is the place where Baitul Maqdis Masjid is, and Baitul Maqdis is the first Qibla for Muslims.
In the narrations from the Ahlul Bayt (AS) we have a narration from Imam Mohammad al Baqir (AS) telling Abu Hamza al Thimali that the great Masjids are four: al Masjid al Haraam in Makkah, the Masjid of the Holy Prophet (SAWA) in Madinah, Masjid Baitul Maqdis in Quds and Masjid al Kufa. The Imam (AS) said : O Aba Hamza, performing obligatory Salaah in any of these Masjids equals performing full Hajj and performing recommended Salaah in any of these Masjids equals performing Umrah. This Hadith is narrated in the book of Man La Yahdharuhu Al Faqih by Al Sadooq , volume 1 page 163.
Also we have narrations mentioned in the same book of Al Faqih by Sheikh Al Sadooq from Ameerul Mo"meneen Ali (AS) that Salaah in Bait Al Maqdis equal one thousand Salaah. Volume 1, page 167 .
A narration also from Ameerul Mo"meneen Ali (AS) that when Imam Al Mahdi (ATFS) comes back to the public life he will go to Bait Al Maqdis. This narration is in Mo"jam Ahaadith Al Imam Al Mahdi (ATFS) volume 4 page 175.