This site cuts the core out of the Big Apple to expose layer upon layer of subterranean activity which keep the world’s most famously vertical city alive.

The quality of the visuals is as good as you would expect of a Web site produced by National Geographic. It revolves around a superbly drawn representation of a notional, 800-ft deep “core sample”, which slices through cables, sewers, heating systems and the subway system, on its way down into the bedrock that supports the forests of skyscrapers.

At each level there are jumping off points - into textual explanations, photo tours, with audio and video clips thrown in for good measure.

If nothing else, from this site you’ll learn why there’s always steam spewing out of pavement vents in all those NYC-based movies.

Florence Nightingale Timelines - www.dnai.comborneonightingaleindex.html

The timeline is a popular and populous Internet sub-species, the tree-and-branch structure of a typical Web site that lends itself so well to annotated, illustrated chronologies.

This is one of hundreds of examples of worthwhile historical timelines on the Net (the worthless ones number in their thousands). Its focus on “the first modern war nurse” illuminates not just the social and political history of the period but also the psychological make-up of the woman who invented modern nursing.

Bill hicks - https:www.tes.co.uk