Great Mosque of al-Nuri

The Great Mosque of al-Nuri was a mosque in Mosul, Iraq. It was famous for its leaning minaret, which gave the city its nickname "the hunchback". Tradition holds that the mosque was first built in the late 12th century, although it underwent many renovations over the years. The mosque withstood various hostile invading forces over its 850-year history until it was destroyed, along with its distinctive minaret, in the Battle of Mosul in 2017.

Iraqi troops attributed the destruction of the Great Mosque to the Islamic State of Iraq and the Levant in a vandalistic move to destroy it rather than let it go from their hold. The mosque had held a symbolic importance to ISIL and its leader, Abu Bakr al-Baghdadi, as it was used in 2014 by the militants to self-declare their "caliphate".

Source: Wikipedia