Mountain Mansion, Colorado, United States

Nineteenth century development
The 19th century saw particularly in the United States a new type of mansion being built, often smaller than the older European mansions. The Breakers in Rhode Island is a fine example, as is the nearby, but completely different, Watts Sherman House.
Fifth Avenue at this time was lined with numerous mansions, designed by the leading architects of the day, many in European gothic styles, built by the many families who were making their fortunes, and thus achieving their social aspirations, in the mid 19th century. However, nearly all of these have now been demolished, thus depriving New York of a boulevard to rival, in the architectural sense, any in Paris, London or Rome—where the many large mansions and palazzi built or remodeled during this era still survive. Mansions built in the countryside were not spared either. One of the most spectacular estates of the U.S., Whitemarsh Hall, was demolished in 1980, along with its extensive gardens, to make way for suburban developments.
Grand Federal Style Mansions designed by Samuel McIntire inhabit an area that, in 2008, is the largest collection of 17th & 18th century structures in the United States of America. This district in Salem Massachusetts is called the McIntire Historic District with the center being Chestnut Street.