Initial estimate for clean-up: $2 billion
City of New York

Actual cost of clean-up: $650 million
City of New York

Final cost to build the Twin Towers in 1972: about $1 billion
NOVA: Why the Towers Fell

Date of ceremony marking end of clean-up: May 30, 2002
Great Projects Film Company

Agency in charge of recovery and clean up: NYC Department of Design and Construction
Great Projects Film Company

Tons of debris cleared: 1.8 million
City of New York

Weight of each tower: 600,000 tons
NOVA: Why the Towers Fell

Number of truckloads of debris: over 100,000
City of New York

Man-hours spent during clean up: 3.1 million
City of New York

Office space destroyed or temporarily useless: 15 million square feet
Century Foundation

Number of construction firms assigned to clean-up: 4
Great Projects Film Company

Number of workers involved in clean-up: about 3,000
Great Projects Film Company

Number of buildings completely destroyed: 8
Great Projects Film Company

During clean-up, number of firefighters per shift: 100
The New York Times

Number of phone lines disrupted by attack: 300,000
The New York Times, 5/12/02

Number of data circuits disabled by attack: 4.4 million
The New York Times, 5/12/02

Number of temporary cellular towers installed after attack: 21
The New York Times, 5/12/02

Feet of subway tunnel crushed: 1,300
Century Foundation

Number of people killed in the attack at the WTC: 2,823
The New York Times, 6/25/02

Percent of victims who have been identified: 42
The New York Times, 6/25/02

Number of firemen killed in the attack: 343
The New York Times, 5/30/02

Total Firefighting force in NYC: 14,000
The New York Times, 5/20/02

Number of New York Police Officers killed in the attack: 23
NYPD Memorial

Number of workers who died during the construction of the World Trade Center: 60

Number of workers who died during the clean-up: 0
City of New York

Number of people critically injured during the clean-up: 0
City of New York

Type of plane that hit the Twin Towers: Boeing 767, 137 tons
U.S. Department of State

Estimated cost of rebuilding WTC site: $26-29 billion
Century Foundation

Estimated cost of rebuilding subway damage: $1.7 billion
Century Foundation

The Twin Towers were designed by American architect Minoru Yamasaki
Great Buildings

Groundbreaking for the Twin Towers was August 5th, 1966
Great Buildings

The first tenants moved into Tower One in December, 1970; occupancy of Tower Two began in 1972
Great Buildings

The Twin Towers, 110 stories high, were the tallest buildings in the world until surpassed by Chicago's Sears Tower in 1976
Great Buildings

About 50,000 people occupied some 10,000,000 square feet of office space
Great Buildings

The Towers' pioneered an elevator system that allowed 25 percent more floor area than conventional elevator designs
Great Buildings

Each floor had about an acre of rentable space
Great Buildings

The Towers were designed to sway as much as 3 feet in high winds
NOVA: Why the Towers Fell

On Friday, February 26, 1993, a massive bomb was detonated by terrorists in the Center's parking garage; 6 persons were killed, and more than 1,000 injured
Great Buildings

More interesting facts about the Twin Towers is available on these Web sites
History of World Trade Center
Great Buildings
NOVA: Why the Towers Fell