I need advice/ideas for places to see. My DD is studying abroad next semester and will be in Luxemborg for 5 mos. I will be going to see her over spring break in April. When my oldest went her jr year we saw Paris and Rome. This time my DD will be finishing up her studies in Germany just before I get there. I was thinking Prague, Vienna and Salzberg, but am open to any advice you travellers might offer. Thanks!