My father worked on the ITER project for many years. This article goes some way to express the shear scale of this project, it's absolutely vast.

When I was a lot younger I was taken on a tour of JET (http://www.efda.org/jet/) and was overawed with the size of it. ITER is an order of magnitude bigger.

The machine that follows ITER is where things get really interesting. Called DEMO, it's still in the planning phase - but will provide a template for future commercial fusion power generation. They're talking about possibly putting fusion generated power into the grid by 2040. Truly exciting stuff.