Graham Reid: Standing in the shoes of Lee Harvey Oswald

A simple wrong turn and the pressure of traffic forced us to carry on down the road, looking for an exit. But then, through a set of traffic lights, we were there.

"This is it," I shouted. "Look, this is it."

I drove on as slowly as the urgent traffic would allow, and we looked around at the slow dip and curve of the road, so recognisable from that famous piece of footage we have been seeing for fortysomething years.

This was the place. So I hooked a left, circled around for a couple of blocks and cautiously made our way back. We pulled over and got out of the car. There it was, the Texas School Book Depository, the famous grassy knoll, the Dealey Plaza ...

As much by chance as intent I have been to any number of slightly ghoulish places.

I have seen where River Phoenix died outside the Viper Room in LA (they've taken away the plaque now) and stood at Elvis' grave a couple of times.

I have been to the modest plaque over Buddy Holly in his hometown of Lubbock, Texas; stumbled on Jim Morrison's graffiti-covered grave in Pere La Chaise in Paris; and have twice been to the last resting place of Jimi Hendrix outside Seattle, first when it was a simple grave which allowed for quiet contemplation, second after they moved him and built a hideous memorial.

But there is something unique about the place in Dallas where John F. Kennedy was assassinated in November 1962 - it is so familiar from those endless (and endlessly, sickly fascinating) replays of the grainy 8mm footage shot by Abraham Zapruder. And the jury of popular opinion is still out on who shot Kennedy, and from where.

The Texas School Book Depository - and who knew Texas needed such a huge building in which to store old books? - is on the corner of Elm and Houston streets in downtown Dallas. It is a magnet for curious tourists, nutcases, historians, the sceptical and the slightly Kennedy-obsessed, and any number of conspiracy theorists.

For the latter there is more research to be undertaken at the Conspiracy Museum about a two blocks away.

I guess if you think Lyndon Baines Johnson had Kennedy killed so he could become President then you are just as likely to believe that Nazis killed the Lindbergh baby.

Around the grassy knoll, men with blazing eyes sell magazines which trace bullet trajectories and have graphic autopsy photographs of Kennedy's shattered brain.

But if you are in Dallas it is impossible not to feel the attraction of the Sixth Floor Museum in the Texas School Book Depository, because there you can hear about Kennedy's life - lots of promises but little achieved seems a fair verdict on his short presidency - and consider the angle of fire that Lee Harvey Oswald would have needed to get off those rapid shots at a moving motorcade below.

You can't actually stand where Oswald stood - that area is sealed off by glass panels - but you can stand at a window nearby. And you look down. And you look back at where Oswald stood and think of the angle. And you look again at the road below, and back to where Oswald would have stood ... I don't know.

All I know is that if Oswald did it, then he was an exceptionally fine marksman.

And that's pretty much what the guy next to me thought too, although the other guy who laughed and said, "Aww man, no way" seemed to be more certain of his opinion.

It's a place where you have to make up your own mind.

It might not be the most pleasant day out, but in the gift shop below you can buy Sixth Floor Museum T-shirts, postcards and kitschy Kennedy memorabilia.

I've got the museum ballpoint pen next to the plaster bust of Ho Chi Minh that I bought in Hanoi after going to see his mummified corpse.

But that's another story.