Stewards of the iconic buildings and grounds of Capitol Hill since 1793.


Black and white picture of the Capitol being built on Capitol Hill in 1793.
The U.S. Capitol was built atop Jenkins’ Hill, now often referred to as “...


View of the U.S. Capitol Building from above at dusk
In order to ensure the safety of visitors and staff and to preserve the...


AOC Gardener at the U.S. Botanic Gardener handling some orchids
Information about working for the Architect of the Capitol:


The figure of Liberty in the Apotheosis of George Washington is depicted wearing a Liberty Cap
The liberty cap was the symbol of freedom and liberty commonly used in the 19th...

Dome By-The-Numbers

Dome By-The-Numbers

Dome Restoration

Rendering of the Dome Restoration Project

1.1 million pounds weight of the scaffold
75,000+ pieces of equipment
52 miles of scaffold pipe
2 miles of decking, enough to build a sidewalk 5 feet wide x 2 miles long from the US Capitol to the Lincoln Memorial
1,215 gallons of paint will be used to repaint the Dome - 3 layers x 405 gallons each. Final top coat color is "Dome White."
5 layers of safety netting in Rotunda
14,700 square feet total Rotunda saftey netting square footage = approximately the size of two tennis courts
6,100 lbs. total weight of Rotunda netting


Dome Weight

8,909,200 pounds weight of Dome = approximately 4,500 tons = about the same weight of 20 Statues of Liberty  

Dome Exterior Height

376 feet height above Potomac River (includes Hill elevation)
288 feet height above East Front Plaza including Statue of Freedom, is the tallest cast iron dome in world approximate height 29 story building
210 feet height above East Front Plaza to the balcony used for Dome tours at Tholos 
199 feet height of Dome measured from Dome Skirt to Base of Freedom
555 feet height of the Washington Monument is 267 feet taller than the U.S. Capitol. Because the base of the Washington Monument is 30 feet above sea level, and that of the Capitol is 88 feet above sea level, the top of the Washington Monument is 209 feet higher than the top of the Capitol Building.

a technical drawing of the Capitol Dome and its interior

Dome Diameter

135 feet measured from exterior
96 feet measured from interior 


180 feet from Rotunda floor to top of the Apotheosis; the Statue of Liberty without her base would fit with room to spare (she is 151 ft)
85 feet from Rotunda floor to first visitor gallery
149 feet from the Rotunda floor to the second visitor gallery
20 feet from the bottom edge of the Apotheosis to the apex at the center of the hemisphere  


108 in Dome
36 windows in Cuploa
36 windows in second story
36 windows in Peristyle
12 windows in Tholos


36 hollow cast-iron columns in peristyle set 10 degrees apart around 360-degree circle
12 columns in Tholos
14 over lapping cast-iron plates make up one section Copula
3/8” to 1/2 " range of thickness of cast iron in Dome
5/8 thickness of cast-iron in the Dome Skirt

An image that shows the size comparison between an up-facing acorn and a basketball

Decorative Features

288 balusters in Boiler Plate Balustrade
80 lbs. approximate weight of decorative acorns
72 acorns total decorative acorns
36 up-facing acorns  
36 down-facing acorns 
36 grape clusters
4 300 watt “in-session” light bulbs Tholos

Statue of FreedomA detailed diagram of the Statue of Freedom


15,000 pounds = approximate weight of 4 cars


38 feet tall Statue of Freedom with base = approximately as high 4 story building
19.5 feet statue height without pedestal
18.5 feet height of pedestal


12 wreaths are on the base of the Statue of Freedom
12 fasces, symbols of legislative authority, are above the wreaths


10 lighting rod points sit atop Freedom’s Roman inspired headdress with native American influences