Nerve Center

Atlanta International Airport is one of the busiest in the world, handling 2,700 landings and take-offs daily.

Grand Central Terminal moves 130,000 passengers a day over 400 miles of track and through 110 stations spread across New York; it's one of the busiest train stations in the world.

The Panama Canal saves 8,000 miles of travel for the 14,000 ships that pass through it annually.

Cirque Du Soleil's "O" has enthralled over 10 million spectators; while 85 artists risk their lives performing over a 1.5 million-gallon pool, 145 technicians ensure that everyone is safe through to the final death-defying act.

D.C. Fire and EMS Department gets more than 150,000 calls a year; it's one of the busiest all-hazards agencies in the U.S.

The Port of LA is the biggest and busiest gateway in North America, covering 7,500 acres, 43 miles of waterfront, and 27 cargo terminals.