I took a good number of pictures of the Tidal Wave when it was standing. I also took some pictures when they were taking it down, and then a few when they were building Batman in its place. The cool thing is... I didn't realize until later on that I had taken a few of those pictures in the exact same spots.
For instance...

Here's the Tidal Wave entrance in 1989, just as we all remember it.

Here's a picture of the same spot, with the entrance closed and the ride gone.
Even more cool were these pictures I took in the Service Corridor:

Here's a 1989 shot of the Tidal Wave from north end of the Service Corridor.

Here is almost the exact same view, with the Tidal Wave gone.

Finally, here is the same spot again, while they were building Batman.
Here are some other pics of the dismantling of the Tidal Wave from the Service Corridor perspective:

Here's the former station area, after they removed the station. Kind of cool (yet sad) to see all the workings that were underneath it.

I can't recall if these columns held up the loop or another portion of the ride... maybe someone out there can help with this. The rusty look is sad against the blue paint.

When I saw this section of the loop just laying in the corridor, I knew that I couldn't just leave it there without getting a memento. So I snuck over and ended up bringing home these:

I initially had two blue and two white bulbs, but I ended up using one of the white bulbs in a lamp (what was I thinking?!?)... in any case, these came right off of that section of the loop, along with a few stones I found underneath the ride-- in three different paint colors to represent the varying shades of blue they had painted the ride over the years. They've survived five moves and 14 years (GOD has it been that long already!?!) in a little box of memories I call my "Great America Box" that has stuff like this inside. I'll be sharing some of my "Great America Box" mementos in these boards as time goes on.

It's a sad truth about rides-- rides come and rides go. But rides like the Tidal Wave will always be special to us for some reason... maybe it's memories of our childhood... maybe it's good times we had. Or maybe it's just that while change is inevitable, it's not always good.
Thank goodness for pictures!!