Created at Harvard University, the Digital Atlas of Roman and Medieval Civilization (DARMC) makes the best available materials for a geographic information systems (GIS) approach to mapping and spatial analysis of the Roman and medieval worlds.
Both students and scholars can profit from this well-designed site, which includes bibliographies, essays, translations of texts, visual images, and course syllabi on women and gender in the ancient world.
The Oriental Institute at the University of Chicago has set up a bibliography of introductory readings on the Ancient Near East. They are grouped under Ancient Egypt, Ancient Nubia, and Ancient Mesopotamia.
This highly-regarded site provides a gateway into classical studies, with a concentration on ancient Greece. Its resources include guides to Greek art and archeology as well as to ancient Greek texts and scholarly literature.
The set of 40 maps begins with an animated map, that depicts the rise and fall of the Roman Empire by landmass, from 500 BC to 476 AD.
The AHA Guide to Historical Literature will get you started on any time period anywhere in the world. The link is to the online version. You might find it easier to start with the print version to see how it is organized.
This entirely new edition of a keystone reference is the place to start researching any topic in any field of history. Hundreds of historians from around the world have selected and provided commentary on the best and most useful works in their fields. It is divided into sections arranged by chronology and national and regional history, with each section introduced by a brief historiographical essay. And it also contains expanded coverage of Africa, Asia, and North and South America.