We passed a small park on Hverfisgata. We could see a circle of volcanic monoliths. We approached to check it out, and noticed an inscribed metal plaque. The stones also had Icelandic words carved into them. It looked to us like it was a monument celebrating 50 years of Icelandic independence from Denmark (1944-1994), while also mentioning Alþingi, the national parliament of Iceland which dates back to 930 A.D.