Reykjavik is the political, cultural, industrial, and commercial center of the country. All of Reykjavik's attractions are located within the city: Höfði House, where the 1986 Reykjavik Summit took place, a historic meeting between the presidents of two superpowers, M. Gorbachev and R. Reagan, where an agreement was signed that effectively ended the Cold War; Perlan - Reykjavik's Pearl, shaped like a daisy flower, and perhaps the most unusual power plant in the world; Hallgrímskirkja, Reykjavik's main cathedral, distinguished by its modern, basalt-like design, created as if from basalt; and the old city center.