The Blue Mosque is a mosque located in the center of Mazar-i-Sharif, Afghanistan.
The Seljuq dynasty sultan Ahmed Sanjar built the first known shrine at this location. It was destroyed or hidden under earthen embankment during the invasion of Genghis Khan in around 1220. In the 15th century, Sultan Husayn Mirza Bayqarah
built the current Blue Mosque here. It is by far the most important
landmark in Mazar-i-Sharif and it is believed that the name of city
(Noble Shrine, Grave of Sharif) originates from this shrine.
A site plan of the location made in the 1910s shows that there had
earlier been a smaller walled precinct in the mosque, which was razed to
create parklands later, although the portals to this precinct still
remain as gateways for the shrine.
Tombs of varying dimensions were added for a number of Afghan
political and religious leaders over the years, which has led to the
development of its current irregular dimensions. These include the
square domed tomb of Amir Dost Muhammad, Wazir Akbar Khan and a similar structure for Amir Sher Ali and his family.
According to a local legend here has been buried Ali
who reportedly was brought here by a white camel in order to save his
remains from the desecration by his enemies. Most Muslims though
consider that Ali is buried in Imam Ali Mosque, Najaf in Iraq.
Alternatively, the personage buried in the shrine may have predated
Islam. Identifying the shrine with Ali could likely be a myth to ensure
the tomb would be protected and honored by the Islamic establishment.
Source : https://en.wikipedia.org/wiki/Shrine_of_Ali