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Strategy[]
If you have a state religion 
, the Spiral Minaret causes all of that religion's buildings to generate gold 
for your civilization. It increases its city's chances of generating a Great Prophet.
Civilopedia entry[]
The Spiral Minaret is a massive brick and clay structure adjacent to the Mosque of al-Mutawakkil in Samarra, Iraq. The mosque was constructed in 852 AD, and at the time was the largest mosque in the world.
A remarkable triumph of ancient engineering, the minaret is a circular tower 170 feet in height. A spiral exterior staircase extends up the tower to the platform where the "muezzin" called the people to prayer. It is said that the caliph al-Mutawakkil once rode up the stairs on a white Egyptian donkey.
An imposing yet magnificent building, the Spiral Minaret still stands today, calling the people of Samarra to prayer at the Mosque of al-Mutawakkil. The more courageous visitors can climb the staircase to the top of the minaret, which appears to lack an outside guardrail.