HyperHistory Online features fantastic timelines with clickable links to the facts.
Description from the site: HyperHistory is an expanding scientific project presenting 3,000 years of world history with an interactive combination of synchronoptic lifelines, timelines, and maps.
I think with this much stuff you can find information on just about anything of note that happened in the last 3000 years. The four major categories are people, events, maps and history. Each is cross-categorical with the others. The site is easy to navigate and the amount of information they have is stunning. Very student friendly.