Skyscrapers - an Entire Website about Really Tall Buildings

"Diagrams - SkyscraperPage.com"
SkyscraperPage.com

"The SkyscraperPage.com Diagrams began in 1997 with a mission to create the world's most comprehensive collection of skyscraper diagrams. With over 21,000 structures drawn by over 590 illustrators our collection of diagrams is the largest and most comprehensive skyscraper diagram database in existence."

While you're there, check out

• Cities
  "Follow the links on the world map to find cities by continent."
• "Forum
  "...Since 1999, SkyscraperPage.com's forum has been one of the most active skyscraper enthusiast communities on the web. The global membership discusses development news and construction activity on projects from around the world, alongside discussions on urban design, architecture, transportation and many other topics...."
• Skyscraper Posters
  They expect you to pay for them: but they look cool

Looks like pretty good resource for general information about those tall buildings.