The World Digital Library hosts more than 19,000 primary documents and images from dozens of libraries around the world. Hosted by the Library of Congress and sponsored in part by the United Nations Educational, Scientific and Cultural Organization, the mission of the World Digital Library is to promote the study and understanding of cultures.
The WDL can be searched by date, era, country, continent, topic, and type of resource. But my favorite way to explore the WDL is by browsing through the interactive maps that are available when you click on the globe icon in the site's header. The WDL aims to be accessible to as many people as possible by providing search tools and content descriptions in multiple languages.
Applications for Education
The World Digital Library can be a great resource for anyone that teaches history and or cultural studies. The wealth of image based resources along with the document based resources makes the WDL appropriate for use with most age groups.