Total cost: $1,187,710
Designer: Robert Mills
Year Started: July 4, 1848
Year Completed: December 6, 1884 (opened to the public: October 9, 1888)
Style: Neo-Egyptian
Depth of foundation: 36 feet 10 inches
Width at base of shaft: 55 feet 1 1/2 inches
Width at top of shaft: 34 feet 5 1/2 inches
Thickness of walls at base of shaft: 15 feet
Thickness of walls at top of shaft: 18 inches
Height of monument above floor: 555 feet 5 1/8 inches
Weight of monument: 90,854 tons
Weight of aluminum tip on capstone: 100 oz (2.8 kg)
Material: Marble brought from Maryland
Capstone weight: 3,300 lbs (1.65 tons)
Sway of monument in 30-mile-per-hour wind: 0.125 of an inch
Number of Blocks: 36,491
How many steps are in the monument: 897
Number of Flags surrounding the monument: 56
Fastest known ascent time via stairs: 6.7 minutes (in 2005)
Admission: Free
Location: National Mall
Visitors per year: 467,550 (in 2005)
