1 of the places which your parents would surely love is Ljubljana. This amazing city is regularly referred to as the second Prague, because of its outstanding architecture. However, it is much less busy and all of those incredible places and buildings can be seen with no lines (more information). Furthermore, even though you will most probably start such trip from the capital city (as there are tons of cheap flights to Ljubljana), there are also plenty of other places which worth to see in Slovenia. For instance, in this small country you can see marvellous Alps and charming lake. And all of it is located in less than 2 hours journey from the capital city. Doesn’t it sound incredible? Your parents would definitely love it!
Another spot which can be a good idea for a trip with your parents is Chicago. The generation of our parents really frequently perceives America as a rich and unavailable country. Actually, it makes sense if we think that most of people in their generation were travelling to Chicago not as tourists, but in case to find a job. http://www.lot.com/airline-tickets/flights-to-chicago