Adiacent to a convent founded by S. Francesco in 1218, the milanese architect Tomaso Buzzi (1900 - 1981) in 1956 started the building of his Ideal City, with a theathrical machina conception. What came out is an astonishing piece of architecture, with an undefinable style and complex esoteric references. It is certainly worth a visit, being only 30 min from Walden.