Hi,
you should see *something* with spacings of 0.02 or higher, though it can be a
bit blurry. How much you will see depends on the form of the tower though, as
it's a nice irregular shape and many photons can be refracted or reflected
anywhere, just not onto the ground. ;)
You could try to put a light into the tower if it uses refraction, this can give
some nice caustics. (Could require some testing ;)
And better don't use refraction and reflection at once, as using both slows it
down quite a bit and doesn't do much for the image in my opinion... unless you
don't mind slow rendering...

I used the following for my tower:
#declare Mat1 = material {
  texture {
    pigment {rgbt <1.0, 1.0, 1.0, 0.9>}
    finish {
      specular 1
      roughness 0.001
      diffuse 1
      ambient 0
    }
  }
  interior {
    ior 1.5
    fade_color rgb <0.85, 0.90, 1.00>
    fade_distance 1.5
    fade_power 1000
  }
}


Btw, my original scene took about 2 hours at 1024*768 with anti aliasing. Photon
spacing was 1/110, max_trace_level 256 (i always use that number :p ) and RAM
usage was almost 1.2 gb, so i couldn't really get much more photons...

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