Divided into six galleries, this website features 21 online exhibits. The first gallery, Binding the Nation, includes six exhibits such as "The Post and the Press" and "Moving West" which explains how the postal service contracted with stagecoach lines to transport mail across the frontier. The second gallery, Customers and Communities, uses a series of exhibits to examine the development of mail delivery to the growing urban and rural populations in the 20th century. For example, through a virtual tour of the "Mail by Rail," visitors learn about the revolutionary Railway Mail Service. Moving the Mail is the third gallery, with three exhibits, and Art of Cards and Letters, the fourth gallery, spotlights the important role mail has held as a medium for personal communications, including "Undercover: The Evolution of the American Envelope." The fifth gallery, Artistic License comprises six exhibits; and the last, the Philatelic Gallery, includes exhibits entitled "Rarities Vault" and "Inverts." This gallery also features changing exhibits featuring special objects from both the Museum and private collections, including an online version of "Mail to the Chief," a collection of original drawings by Franklin Roosevelt of the many stamps he designed.

There are also two research guides online for the Benjamin B. Lipsner Airmail Collection and for the 1847 Federal Postage Stamp Correspondence. An Activity Zone offers materials for young students and free downloadable curriculum guides (grades K through college level) are available for teachers. The 24 online articles from EnRoute, the National Postal Museum's membership magazine, complete this rich site.

This archive makes available varied material on English, American, and Missouri history, including speeches, pamphlets, plat books, and government documents. The collection of Daniel Webster speeches offers more than 100 items that, in addition to his addresses and speeches in Congress, include sermons, addresses, orations, and speeches in his honor, as well as some correspondence. The Fourth of July orations collection contains more than 100 items, including orations by John Quincy Adams, Charles F. Adams, and Daniel Webster. The site also offers a collection of more than 110 Missouri county plat books published in 1930, a collection of various items of Missouriana, and a group of four miscellaneous texts that includes an 80-page text on the liberty of the press published in London in 1812. The collection of 17th- to 19th-century British religious, political, and legal tracts contains more than 400 documents and pamphlets published primarily during the English Civil War. Each collection can be individually searched. For anyone researching 17th- and 18th-century transatlantic history, the political history of New England, or the history of Missouri, this is a collection worth consulting.

Provides historical information and photographs pertaining to more than 300 surveying instruments used in America to delimit land and transport boundaries "since the first European colonists settled here some 400 years ago and turned the American landscape into property." Visitors may browse by 23 types of instruments—from alidades to zenith telescopes—and by 117 names of instrument makers. Informative texts on makers, types of instruments, and specific instruments run from one sentence to 300 words in length. Entries include bibliographic references. Of value for those studying the history of science and technology.

Provides approximately 50 maps and paragraph-long descriptions of more than 1,000 maps in the Library of Congress' collections pertaining to exploration, colonization, and military efforts and concerns by Spain and Portugal from the mid-16th century to 1900. Includes approximately 10 maps of Mexico and southwest U.S. made during the U.S.-Mexican War of 1846-1848; and five pertaining to Spanish claims in North America. An 8,700-word informative guide provides historical background. While the site will be useful to those planning to visit the Library's extensive map collection, online visitors may be frustrated by the lack of search capabilities. Maps included in the site are not indexed, and users can access them only by paging through the entire catalog.

A selection of approximately 200 historical maps covering all parts of the world and ranging in time from the early 16th to the late 19th centuries. Provides more than 50 maps of the Americas, with 16 of American cities. Includes a 1641 map showing the layout of the New Haven community and a 1770 "New Map of the Cherokee Nation." Links to five previous exhibitions with 60 maps and explanatory texts of between 1,600 and 2,800 words each on road maps, three-dimensional maps, and fanciful maps. The site also includes listings for 19 reference sources and links to 48 other sites for maps and cartographic studies. A modest, but useful collection for those studying the history of cartography and exploration, and those needing cartographic aids for other historical subjects.

Gateway to more than 100 links, most of which provide visitors with the capability to search for events that occurred on specific days. "Specialty sites" link to resources dealing with specific ethnic groups, entertainment forms, politics, professions, regions, and countries. Users can find hundreds of holidays, birthdays of famous people, and calendar-related quotations, as well as links to events involving African Americans, American Indians, popular culture, sports, radical history, psychology, health, and the literary world. No depth, mostly trivia, but still of use to students and teachers who need to check a date.

This site is home to two related exhibits about the exploration and settlement of the American West. "Heading West" is a collection of 15 maps produced between 1540 and 1900 and divided into five categories: imagining, exploring, settling, mining, and traveling. A 700-word essay introduces the exhibit and each image is accompanied by 50-400 words of explanation. The site links to 16 other sites about exploration and maps of the West. "Touring West" is a collection of materials about performers who toured the west in the 19th century. It is divided into five sections: travel, abolitionists, railroads, recitals, and heroics. Visitors will find 3 images in each section and 50-400 words of explanation. The images include prints and photographs of performers, programs, and promotional posters. An introductory essay of 500-words describes the collection. The site offers 15 links to sites about performance. Both exhibits will be useful to those interested in the West, performance, or search of illustrations.

This exhibit presents 60 items from Paul Mellon's private collection of material relating to the history of Virginia. The entire collection, 447 items, is housed at the University of Virginia. A 600-word essay provides biographical information on Mellon and his bequest. The exhibit is arranged in six sections, from "Exploring the New World" through "Slavery and the Civil War" to "Opening New Vistas". "Acquiring Virginia's Legacy" presents six highlights of the collection and a 1,400-word essay explaining its significance. A 150-word explanatory essay accompanies each image. The exhibit includes facsimiles of 11 books, seven prints, seven letters, five objects of ephemera, and five maps. Among the ephemera is a myriopticon, a rolled painting that viewers can "unroll" to view scenes from the Civil War. The site is primarily interesting as an exhibit and may not be particularly useful for researchers except as an introduction to the Mellon collection.

This American Memory website traces the history of the Upper Midwest (Michigan, Minnesota, and Wisconsin) from the 17th century to the early 20th century, through 138 volumes drawn from the Library of Congress General Collection and the Rare Books and Special Collection Division. Selected works include first-person accounts, biographies, promotional literature, local histories, ethnographic and antiquarian texts, and colonial archival documents that depict the region's land and resources, cross-cultural encounters, experiences of pioneers and missionaries, soldiers, immigrants, reformers, growth of communities, and development of local culture and society. Each work is available in full-text transcription or page image, and is accompanied by notes giving the title, author, publication information, and a 300–350 word summary of the contents.

The site also offers a 2,000-word essay on the history of the Upper Midwest that covers the discovery, exploration, settlement, and development of the region from pre-contact to the early 20th century; a regional map dated 1873; links to more than 40 related websites; and a bibliography of nine related works, three of which are ideal for younger readers. The site can be searched by keyword and browsed by author, subject, and title. For those interested in the history of the Upper Midwest and Great Lakes region, this site offers some informative resources.

Documenting more than 5,000 years of sewage history, this site contains a plethora of sources addressing the historical, cultural, engineering, and even literary aspects of sewers. Beginning in roughly 3,500 BCE and continuing into the 20th century, the site includes a detailed timeline of major sewage developments, as well as links to histories of 14 major cities' sewage systems, including Washington, DC and Los Angeles.

In addition to two histories of the modern toilet, there are more than two dozen articles about aspects of sewage design, including short (500–1,000 word) introductions, engineering text, and even PDF diagrams. As well, there is a feature highlighting the many animals found living in metropolitan sewers and a virtual tour of the Paris, France, sewer system. A bibliography introduces users and researchers to major secondary works on sewage and sewer history. A Miscellaneous area collects literary references to sewers, including works by Robert Frost and Ben Jonson.