The United States National Archives and Records Administration (NARA) has a many online resources to offer educators and students.
Their Educators and Students page is filled with lesson plans, high-quality images of NARA documents and photographs, source catalogs, and interactive exhibits.
Information for Educators
Teaching With Documents Lesson Plans
Teaching With Documents Exhibit
Collaborate with the National Archives
Training for Teachers
School Workshops and Community Group Presentations
Bringing Your Class to the National Archives in D.C.
New Boeing Learning Center at the National Archives Building
More Primary Sources - Archival Research Catalog (ARC)
Information for Students
Meet America's Founding Fathers
Sign the Declaration
What is the National Archives?
Introductory Research Activity
Archival Research Catalog (ARC) Guide for Students
Visiting the National Archives
The Digital Vaults interactive module