smooth, it is so lovely. face—to—face with italy's stolen art. wow, it is beautiful. and up to my neck in it in rural estonia. hello and welcome to switzerland. i'm in the town of chateau—d'oex. it is known for its gruyere cheese, which is delicious, and the international balloon festival, held in the valley behind me every winter. but let's start somewhere a little warmer. mexico city's ancient canal network was first built by the aztecs. it stretches 180 kilometres and these days the whole district of xochimilco is a unesco world heritage site