NASA Quest
http://quest.nasa.gov/
Everything you wanted to know about NASA. Read profiles of (or chat with) NASA experts, learn about space exploration and the history of flight, find links to NASA's other interactive websites, and review tons of facts and tidbits in the huge FAQ section.

Engineering: Your Future
http://www.asee.org/precollege/
A mammoth site for high school students contemplating engineering as a career. Sections like "Benefits of Being an Engineer," "Engineering Disciplines," and "Finding and Affording the Right School" are chock full of valuable information, while the list of famous people who have either been engineers or studied it is downright inspirational.

Building Big
http://www.pbs.org/wgbh/buildingbig/profile/
Interviews with real-world working engineers fill this site, along with useful information about careers in the various engineering fields. Learn about bridges, domes, skyscrapers, dams, and tunnels—and the "big building" behind them.

Engineering.com
http://www.engineering.com
Available in both German and English, this site boasts the imposingly named Solution Machine, an engineering-specific search engine, as well as helpful tips, salary profiles, puzzles and more.

Ordnance Survey
http://www.ordsvy.gov.uk/
Hosted by Britain’s national mapping agency, this jam-packed site is all about maps, maps, maps. A huge “Free & Fun” section lets you create annotated, colored maps of your own, download mapping wallpaper, play interactive mapping games, and learn everything you ever wanted to know about the mapping and geography of Britain and Europe.