The Victorian style was architecture used during the reign of Queen Victoria in Great Britain (1837-1901). Victorian architecture originated in Europe as a combination of revivals of older styles (such as Gothic and Italianate). The architects tried to revive the old styles, and also incorporate modern needs and attitudes.
Victorian style houses were often built narrow and tall. That way, they could easily be lined up side to side. They had steep roofs, decorations on the outside, and often multicolored walls. Some common characteristics of Victorian architecture are bay windows, stairs to the front door, and cone shaped turrets. It is also common to have horizontal ridges at the roof line and above each window.
One of the best places in the United States to find examples of Victorian architecture is San Francisco. The houses seem to fit well into the landscape of steep hills with houses crammed up against each other.