Basic culture building of the Ancient Era. Available from the start of the game.
The Monument increases the Culture of a city, speeding the growth of the city's territory and the civilization's acquisition of Social Policies. It's the first building available for every city, without having to research any technology.
Note that under normal circumstances (that is, without social policies or civilization modifiers) a city starts with 0 Culture, which means its borders won't grow AT ALL. If you want to achieve border growth for that city, you need to build a Monument first thing.
A monument is a structure built to commemorate an important person, event, deity, or concept. The more important monuments are usually constructed near the center of the city, by the ruler's palace, or near the city's main gates. Monuments come in all shapes and sizes, from the Great Sphinx of Giza, Egypt, to the Statue of Liberty in New York City, USA, to Nelson's Column in London, England. The best of them imbue the city's inhabitants with a great feeling of civic and national pride.