SPECIFIC MUSEUMS:
National Museum of Women in the Arts
    The first national museum focusing exclusively on artworks by women
The Metropolitan Museum of Art in New York, New York
The National Civil Rights Museum in Memphis, Tennessee
Women of the West Museum in Denver, Colorado
National Museum of the American Indian in New York, New York, Suitland, Maryland, 
      and soon to be in Washington, DC

LIBRARIES AND ARCHIVES:
The Arthur and Eizabeth Schlesinger Library on the History of Women 
     at Radcliffe College in Cambridge, Massachusetts
The Sophia Smith Collection at Smith College, Northampton, Massachusetts
National First Ladies Library
      An archive educating people about the contributions of our Presidents' wives
The Minerva Center
       A foundation for the study of women in the military
The Lesbian History Archives in New York, New York

SPECIFIC WOMEN'S HISTORY SITES:
Women's Rights National Historical Park in Seneca Falls, New York
First Ladies National Historic Site in Canton, Ohio
The National Women's Hall of Fame in Seneca Falls, New York
Susan B. Anthony's House in Rochester, New York

RELATED SUBJECT INTERESTS:
Our Shared History: African-American Heritage
     A guide to National Park Service sites which relate to African-American history, 
     including several women's sites. This is one of my favorites.
An American Jewish History
     Jewish heritage and contributions to American history
National Japanese American Historical Society
Celebrating Hispanic Heritage
     Biographies of important Hispanic figures (mostly contemporary), plus a timeline
Jewish Heroes and Heroines in America From Colonial Times to 1900
The Lesbian History Project 

LEWIS & CLARK TRAIL:
The Lewis and Clark Trail Heritage Foundation
Lewis and Clark on the Information Superhighway
          lists Internet sites and links on Lewis & Clark throughout the country.