Henry Plant hired New York architect J. A. Wood to design the luxurious Tampa Bay Hotel in the style of a Moorish palace.

Washington DC was formed in 1790 and is home to United States government buildings including the Capitol, White House, Supreme Court building

The Lyndhurst mansion was designed by Alexander Jackson Davis in the Gothic Revival-style. The 67-acre estate landscape design was the work of Ferdinand Mangold. The Tarrytown estate had three resident families: the Pauldings, the Merritts and the Goulds.

Norwalk native LeGrand Lockwood, New York financier, railroad magnate, and Treasurer of the New York Stock Exchange purchased 35 acres in Norwalk, Connecticut to build his country estate. French-trained architect Detlef Lienau was commissioned to design a technologically advanced 62-room mansion with indoor plumbing, running hot and cold water, burglar alarm system and heat and ventilation controls.

In 1895, Frederick W. Vanderbilt purchased the Langdon estate, comprised of 153 acres, a structurally unsound house, a farm and 459 acres on the east side of Post Road. Hyde Park was the name of the stately home he commissioned for himself and his wife, Louise and it was built between 1896 and 1899 on approximately 600 acres. The mansion on a bluff overlooking the Hudson River in Hyde Park, N.Y., this was one of several homes owned by the couple.