World Trade Center | center | Kennedy Space Center | Walker Art Center | Woodrow Wilson International Center for Scholars | Marshall Space Flight Center | Rockefeller Center | Lyndon B. Johnson Space Center | Goddard Space Flight Center | Georgia World Congress Center | Staples Center | Lincoln Center for the Performing Arts | Tanglewood Music Center | National Center for Biotechnology Information | John F. Kennedy Center for the Performing Arts | Center for Constitutional Rights | Georgetown University Law Center | Art Center College of Design | Southern Poverty Law Center | George C. Marshall European Center for Security Studies | Beth Israel Deaconess Medical Center | University of Pittsburgh Medical Center | Prudential Center | Painted Bride Art Center | National Center for Atmospheric Research | Langley Research Center | German Aerospace Center | center (basketball) | United Center | California Pacific Medical Center |
A new set of episodes was shot in 2004 and 2005, centered around two cities and three trauma centers: Baltimore, Maryland (University of Maryland Shock Trauma Center) and Toronto, Ontario, Canada (Sunnybrook and Women's College Health Sciences Centre; Toronto St. Michael's Hospital).