What Islamic city was one of the most precious jewels in terms of urban architectural development,still referred to by its inhabitants as "half the world"?

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Isfahan, located in present-day Iran, was known as "half the world" because of its stunning urban architecture and beauty. It was a center for Islamic art, architecture, and philosophy during the 16th and 17th centuries. Some of the most famous buildings in Isfahan include the Masjid-i Jami (Friday Mosque), the Naqsh-e Jahan Square, and the Ali Qapu Palace, all of which exhibit the intricate tile work, mosaics, and calligraphy that are characteristic of Islamic architecture.

What Islamic City Was One of the Most Precious Jewels