Speculations on what the world would be like if certain events that happened didn't, or vice versa.

This category lists sites devoted to cultural history relevant to language, religious beliefs, values, and customs shared by groups of people.

Sites and categories devoted to events of large-scale damage and destruction. Misfortunes include both natural disasters such as floods and earthquakes, and also accidents and failures of human judgment or technology.

The search, discovery, and charting of our world and beyond.

Sites pertaining to maritime history. For example the history of sailing, maritime trade, naval architecture, navigation, naval warfare, exploration, and related topics.

Links to places of historical importance or interest.

Covers the development of science within a regional, topical, social or political context. Many scientific discoveries were influenced or hindered by the political and cultural climate of the times.

Social historians attempt to understand everyday human experience, and in particular to construct narratives of the lower socioeconomic classes and other groups not represented in traditional literary or governing circles--the subject of political, intellectual, and military histories. The term "social history" first arose during the Progressive Era as interest grew in the contemporary and historical status of people in the middle and lower classes. By the late 20th century, the study had been expanded to women, ethnic minorities, and others deemed marginalized. Closely related to social history are women's history, cultural history, economic history, and labor history.

World History is an academic approach which studies the epochal progress of global human civilization. Comparative, interactive, and synthetic studies alike at the supranational and transnational level are appropriate to this category.