This fellow from Norfolk, England has spent the last 30 years building a 1:100 scale model of the Temple as it was in Jesus' time. He is still not finished, and probably won't finish in his lifetime since he is now 78, but the total area of the model is 20'x12' and contains over 4,000 individually hand-carved 1/2" tall figures (those little figures are people, which gives you an idea how massive this thing is). Each one of the clay bricks are hand made and fired. Apparently, this is most historically accurate model ever created.
I don't know what would inspire someone to spend 30,000+ hours of their life doing this, but I do find the end result thoroughly inspiring.