Well :) if you would vote me to the emperor of everything (don’t recommend it, i have eccentric tendencies) I would dig up a mile by mile by mile of random cube somewhere and document it in excruciating detail. Kinda like a paleontological version of the Hubble Deep Field image. A very detailed and very good look at somewhere where otherwise we don’t expect to find anything particularly interesting.
Indiana Jones and the Tomography of Doom
I'd love to see an /r/TheyDidTheMath on the energy required to CT scan the entire Earth all the way thru. I assume you'd have to vaporize the planet.
You could do secants rather than diameters. Just image the surface layers. Although even just the 5km or so to the horizon sounds like a scary amount of energy.