Apropos of the theme, I have a family member who does height work. Every year (typically in the months where weather will allow), he gets contracted to do some disassembly of buildings at Sellafield (Windscale as was). What follows is hearsay, but still fun :)

The typical way to raze building involves just knocking them down; these are actual disassemblies. They'll go up and unbolt and slice off pieces, and carefully lower them, where they'll be examined and tagged and bagged for onwards disposal. It's a really expensive way to remove a building. There are sections of the site where he's been told "do NOT stop walking in front of THIS building". There are rooms (and maybe entire buildings) for which the records of what radioactive fun went on in them have been lost. There are dangerously radioactive (provenance unknown) things effectively dumped in ponds that have to be removed carefully, a piece at a time, possibly involving underwater disassembly. Possibly including a car that sucked up a big dose of something it shouldn't and needed to be made relatively safer, quickly.

The only saving grace is that when you have to disassemble things so slowly, the handful of people hired to do it can literally only be paid so much per day. It's going to cost orders of magnitude more than just knocking a building down, but spread over decades and decades.