The Prophet Jonah is one of the most famous figures of the Old Testament. The story of the reluctant prophet who was swallowed by a whale (or a giant fish depending on translation) was even referenced by Jesus Christ as recorded in the Gospel of Matthew:
But he answered and said unto them, An evil and adulterous generation seeketh after a sign; and there shall no sign be given to it, but the sign of the prophet Jonas:
For as Jonas was three days and three nights in the whale’s belly; so shall the Son of man be three days and three nights in the heart of the earth.
The men of Nineveh shall rise in judgment with this generation, and shall condemn it: because they repented at the preaching of Jonas; and, behold, a greater than Jonas is here.
—Gospel of Matthew, chapter 12 verses 39–41
In Mosul, which is now where Nineveh once stood, a shrine and tomb stood for the prophet. According to Wikipedia:
On one of the two most prominent mounds of Nineveh ruins, rises the Mosque (an Nestorian-Assyrian Church before) of prophet Younis “Biblical Jonah”, the son of Amittai, from the 8th century BC which is believed to be the burial place of him, and where King Esarhaddon had once built a palace.
This old shrine standing on the site of a Christian church is a stone’s throw from the built-up walls and gates of Nineveh. In the middle of the mosque stood a sepulcher, covered with a Persian carpet of silk and silver, and at the four corners, great copper candlesticks with wax tapers, besides several lamps and ostrich shells that hung down from the roof. A whale’s tooth, appropriate to Jonah’s well-known adventure at sea, is said to be preserved there.
It is one of the most important mosques in Mosul and one of the few historic mosques that are found in the east side of the city.
Now, ISIS has destroyed the tomb. According to a report via Shoebat.com:
On Friday a local Nineveh official, Zuhair al-Chalabi said that there is information that almost certainly confirms that members of the organization of the Islamic state in Iraq and the Levant dug up the grave of the Prophet Younis in the east of Mosul.
Al-Chalabi said in an interview for IraqiNews.com, that “The elements of ISIL controlled the mosque of the Prophet Younis in Mosul since they invaded the city. It is still held by them until now,” pointing out that “elements of ISIL engaged in the process of tampering with the contents of the Mosque.”
Al-Chalabi added that “there is almost certain information stating the fact that the elements of ISIL dug up the grave of the Prophet Younis.”
Here is purported video of the destruction:
In addition to the tomb, the ISIS also destroyed 11 churches and monasteries out of the 35 that existed in the city of Mosul. The ISIS is determined to destroy all traces of other religions as well as parts of Islam it considers to be idolatrous. Recently, claims were made that the group even intends to destroy the Kaaba, one of the most sacred buildings in Islam.