The Old City of Sana'a is a UNESCO World Heritage site located in Yemen. Known for its unique architecture, the city features multi-story buildings made of rammed earth and decorated with intricate geometric patterns. Its narrow streets are lined with traditional houses, many of which date back over a thousand years. The city is also home to several historic mosques and markets, reflecting its rich cultural heritage. The Great Mosque of Sana'a, one of the oldest mosques in the world, is a significant landmark. The Old City serves as a testament to the region's history and architectural ingenuity.