If you're looking for some alternatives to Wikipedia, try searching for information in these collections of reference books. You'll be able to check facts and learn context for any number of topics.
A collection of primary documents, reference works, monographs, images, maps, illustrations, and time lines depicting essential activities of daily life across the globe and throughout history.
Online version of the 23 volume dictionary showing the first known usage of a word in English. Browse the dictionary, search by subject, usage, region or origin or look at timelines and historical Thesauri.
Medieval Technology and American History is a project focusing on the use of medieval technologies in early American settlements. Includes introductory and in-depth articles, timelines, photos & videos and a number of other resources.
The website includes over 300 documents, dozens of images, and information on the following topics: Brigata, the Plague, Literature, History, Society, Religion, the Arts, Maps, and bibliographies.
This website offers an interactive cartographic history of the relationships between hydrological and hydraulic systems and their impact on the urban development of Rome, Italy.