American rule introduced new architectural styles. This led to the construction of government buildings and Art Deco theaters. During the American period, some semblance of city planning using the architectural designs and master plans by Daniel Burnham was done on the portions of the city of Manila. Part of the Burnham plan was the construction of government buildings that resembled Greek or Neoclassical architecture. In Iloilo, structures from both the Spanish and American periods can still be seen, especially in Calle Real. Certain areas of the country like Batanes have slight differences as both Spanish and Filipino ways of architecture assimilated differently due to the climate. Limestones were used as a building material, with houses being built to withstand typhoons.