Ancient and Classical History 

• About.com: Index of Ancient Rome
  An extensive list of resources about Roman history, art, language, and culture.
• Ancient and Classic Cultures
  Briefly annotated links arranged by subject from the Multnomah County Library.
• Ancient and Lost Civilizations
  Tons of links about ancient and lost civilizations of both the Old World and the New. Includes China, Egypt, India, Greece, MesoAmerican, and Sumer among many others.
• Ancient Greece (The British Museum)
  "The site is divided into ten 'chapters' which address themes or topics relevant to ancient Greece." Although primarily aimed at the middle school level, there are items of interest here for all.
• Ancient History Resources
  Nice set of subject links gathered by a Maryland educator.
• Ancient Mesopotamia: This History, Our History
  "The purpose of this website is to disseminate knowledge and awareness of this ancient civilization that will lead to a better understanding of ourselves, others, and of current events for the K-12 community."
• Ancient Rome
  History, biography, timelines, maps, literature, art... all sorts of information on ancient Rome.
• Ancient World Web
  Extensive subject-organized set of annotated links to resources about the ancient world.
• BBC: Ancient History
  Part of the BBC's large selection of educational offerings.
• Best of History Websites
  "Award-winning portal created for students, history educators, and general history enthusiasts. Here you'll find sites, rated for usefulness and accuracy, that will help you study or teach a wide variety of topics and periods in History."
• Classics Unveiled
  Portal to four classics sites online: MythNET (classical mythology), Rome Unleashed (Roman history), Rome Exposed (Roman life), and Latin Wordstock (Latin vocabulary and derivatives).
• The Classics Pages
  "Over 1000 pages of news, information, games and controversy about the life, literature, art and archaeology of the ancient world of Greece & Rome."
• Digital Roman Forum
  What the forum was like in late classical times.
• Exploring Ancient World Cultures
  "An on-line course supplement for students and teachers of the ancient and medieval worlds. It features its own essays and primary texts. ... In addition, to its own resources, EAWC also includes a substantial index of internet sites, divided into five sub-indices: a chronology, an essay index, an image index, an internet site index and an electronic text index."
• Forum Romanum
  Collection of links concerning Latin language and Roman history and culture, with many visual images. A Perseus Award site.
• Greco-Persian Wars: Thermopylae
  Detailed description of the historic battle.
• Halsall Internet Ancient History Sourcebook
  This site "contains hundred of local files as well as links to source texts throughout the net", covering areas including Mesopotamia, Egypt, Greece, Rome, and Christian Origins among others.
• History Link 101
  "The cultures of Africa, Aztec, China, Egypt, Greece, Mayan, Mesopotamia, Rome, Olmec, Prehistory, Middle Ages and World War II are divided into categories of Art, Biographies, Daily Life, Maps, Pictures and Research and more."
• IPL: Social Sciences: Prehistoric and Ancient History
  Links to valuable websites on ancient history.
• LacusCurtius: A Gateway to the Roman World
  Roman antiquities, texts, architecture, maps, and scholarly works about the classical world.
• Livius: Articles on Ancient History
  Livius is a site containing dozens of articles on varying ancient history topics by a professor of ancient history.
• Perseus Project
  Contains many digital resources for the study of the ancient world.
• The Roman Empire
  Companion website to a PBS series about the Roman Empire in the first century.
• World History - HyperHistory
  This is an excellent reference covering people, events, and maps over 3,000 years of history. (Requires Java.)