As a result of the Qajar dynasty's heavy influence on the city of Semnan, especially under Fath Ali Shah's reign, some families in Semnan can trace their lineage back to the Qajar dynasty. Furthermore, much of the city's most important monuments have been built under Turkic dynasties. For example, the Jame' Mosque of Semnan, constructed nearly 1,000 years ago, was built by the Seljuq dynasty. The Imam Mosque, originally known as Soltani Mosque, was constructed by the Qajar dynasty. The Gate of Semman, or Arg e Semnan, which is the representative symbol of the city of Semnan, was also constructed by the Qajar dynasty. Many other historical sites within the city and the surrounding villages demonstrate a strong Turkic and Ilkhanate influence in their architectural designs.