The Jameh Mosque of Qazvin, also known as the Friday Mosque, is one of Iran’s oldest mosques, showcasing stunning Seljuk architecture. Built in 807 CE on the site of a Sassanian fire temple, it has evolved through various dynasties, with significant expansions under the Seljuk, Safavid, and Qajar periods. The mosque features a large courtyard, four iwans, and exquisite ornamentation, including intricate tilework and calligraphy. Recognized as a national monument, it attracts tourists and scholars alike. Situated in Qazvin, a city with a rich history as the Safavid capital, the mosque stands as a testament to Iran’s cultural heritage.