The 19th century was known as a period of eclecticism in architecture. Eclecticism implies that architects were free to choose styles from the past that they felt were appropriate. It incorporated a mixture of elements from previous historical styles to create something new. The two main characteristics of 19th century architecture were the use of a variety of historical styles like Greek Revival, Gothic Revival, Second Empire, and the development of new materials and structural methods. Some famous buildings from this period include the Flatiron Building in New York, the Houses of Parliament in London, and the Eiffel Tower in Paris.