Dublin, the capital of the Republic of Ireland, is located on the east coast of Ireland at the mouth of the River Liffey and has a population of about 544,107. Dublin is one of the most famous tourist cities in Ireland, as it includes several landmarks that make it a center for attracting tourists. The city contains a unique infrastructure that provides services that meet the needs of tourists and includes the finest restaurants, hotels and cafes. Its historic buildings include Dublin Castle, which dates back to the thirteenth century, and St. Patrick's Cathedral, which was founded in 1191. Besides, it has beautiful gardens with wonderful green animals and plants such as the landscaped St. Stephen's Green and the huge Phoenix Garden that contains At Dublin Zoo. One of the most important landmarks is also the Irish National Museum of Irish Heritage and Culture, which includes the most important artifacts from different eras.