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Bulfinch's Legacy
Each Architect of the Capitol helped shape the iconic buildings and grounds we know today.
Capitol Dome
The U.S. Capitol’s dome made of cast iron was designed by Thomas U. Walter and constructed from 1856-1866 at the total cost of $1,047,291.
U.S. Capitol Grounds
The grounds immediately surrounding the U.S. Capitol are bordered by a stone wall and cover an area of 58.8 acres. Its boundaries are Independence Avenue on the south, Constitution Avenue on the north, First Street NE/SE on the east, and First Street NW/SW on the west.