Here's a site that can keep you busy for a long time! This virtual tour of the White House has current floor plans of each floor and section of the building as well as ground layouts -PLUS historical floor plans from various eras in its history. Click on the rooms to see photos of what's inside, and how the room looked in the past. Each page has more information, such as which president and First Lady slept in twin beds or separate rooms. I learned about the "bachelor suite" used by young men who courted Woodrow Wilson's daughters, and how Zachary Taylor's slaves had to climb a ladder to get to their attic rooms. Link -via the Presurfer
Note: I had some trouble with the "Residence Overview" page. You may have to hit your back button to get out of that one.