Exxon Valdez Oil Spill
One of the worst man-made environmental disasters in history, the Exxon Valdez oil tanker spilled over 11,000,000 gallons of oil into Prince William Sound. Check out this website to learn about its terrible effects.
The Great Chicago Fire of 1871: Did the Cow Do It?
What really caused the Great Chicago Fire? Read more here.
As this site states, it is "a unique resource" for those wishing to study the Titanic tragedy. Read articles from historians, study the passenger list, and look at artifacts. One could easily spend hours perusing the wealth of information available here.
San Francisco Earthquake - 1989
The Museum of the City of San Francisco has numerous records available for study of the 1989 earthquake that collapsed a portion of the San Francisco-Oakland Bay Bridge.
Space Shuttle Challenger Disaster Report
Read the report of the Presidential Commission on the Space Shuttle Challenger Accident. Note, not all parts of the report are available online at this time.