Poland is getting more and more popular every year. The medieval towns, rich history, low prices, amazing food and alcohol and affordable accommodation attract many visitors.
Also, Wieliczka Salt Mine and Auschwitz Concentration camp are known in the world. But not everyone should visit Auschwitz and it shouldn't be treated as a tourist destination. If you want to know why, have a look at the article about Auschwitz below.
However, there are some magnificent places which are not well known - like the trails in the pristine Tatra Mountains. Except from the famous Morskie Oko lake trail (which is the least attractive), the other trails are virtually unknown to foreigners. And they're like paradise - filled with crystal clear lakes and surrounded by snowy peaks of the rocky Tatra Mountains.
Visit also some off the beaten path, beautiful villages in the East of the country and other, less know cities.