Obviously this is one of the most recognized homes in the world, 1600 Pennsylvania Avenue. But much is different than on my first visits here as an adult in circa 1967 or 68. You can see several of those changes in this photo. And more clearly on the second one. You cannot today even approach the fence as they have a second one, nor walk on the street than runs on the back side. The fence is more secure, the gates bigger, the road in front is pedestrian only today, no cars, many more guards and security and note the roof. 

More telling is being here on 9/11, note the flag at half mast.