Reykjavík City Hall is the administrative hub of Reykjavík, housing the City Council and city administration offices. It's a cool spot where you can check out the Iceland Replica, a detailed model of the country. You can also rent out the Tjarnarsalur for events like concerts or art exhibitions. Guided tours are available if you want to explore the building and learn more about its history. So, if you're in Reykjavík and want to see where the city's magic happens, swing by City Hall for a peek!