Sana'a, the capital city of Yemen, is one of the oldest continuously inhabited cities in the world. It is a fusion of two worlds - the old and new. The old city, which can be entered through the Bab-al-Yemen - meaning gate of Yemen- is a UNESCO World Heritage Site. It contains some of the oldest buildings in the city. It houses the Sana'a market and the Jami Masjid, the oldest mosque in the country. The streets of Sana'a are lined with shops that sell perfumed incense called 'bukhur' and even musk perfume. A drive through the city of Sana'a is an education in all things Yemeni.