Doric order

The architecture in Greece in quite vast so we will see that in parts:1:Some great column capitals were created which along with the entablature were called "the orders".One of this order in found in maximum structures in Greece.2:the visual corrections.the greks were the first to take into consideration the minute errors that occured due the perception by the human eye and devised methods to eliminate them.3:different types of structures.Doric
Doric Style
The Doric style is rather sturdy and its top (the capital), is plain. This style was used in mainland Greece and the colonies in southern Italy and Sicily.  

This an example of doric order in USA:NYC custom house.