I have to admit this is kind of cool and very crazy at the same time.
Early 2008 an ambitious plan was launched to realize roads and carparks under Amsterdams historic city centre, called AMFORA (Alternative Multifunctional Underground Space Amsterdam). This is a plan by Strukton and Zwarts & Jansma. Bert de Muynck | movingcities interviewed prof Moshe Zwarts, director Zwarts & Jansma, on the proposal his office made. Read more and see images on the Dutch underground urbanism in 'City under the City'.