The ancient city of Riga, which was selected as the United Nations World Natural Heritage Site in 1971, has a history of more than 800 years. It is small in size and historical sites and buildings are well preserved. The whole city is listed as a world cultural heritage. It is not a name for the world. It is a city suitable for measuring with your feet. Walking on a Gothic-style street will make you mistakenly think that you are in a romantic fairy tale world. In the 19th century, Riga became an important economic center. The suburbs of medieval towns have been built, and the style has changed from the beginning of classical wooden architecture to the "new art" style. Riga is seen as the center of Europe's finest Art Nouveau architectural style. The Riga historical monument includes six famous sites. The ruins include the heart of the ancient Riga, the brick dome, St. Peter's Church, St. Jacob's Church, St. John's Church, the Powder Tower, the Swedish Gate, the Riga Castle, and many museums and art galleries. Dome Church - Santa Maria Cathedral is a bishop's cathedral. This famous historic monument has become a symbol of the ancient town of Riga. It has been rebuilt several times over the past few centuries, so the current building contains many different architectural elements. Bishop Albert began building new cathedrals and monasteries in 1211, and the first phase of construction in 1270 was completed. The spire of the Dome Church was once the tallest spire in the city, 140 meters high.