Krakow

Krakow, the old capital of Poland, is only a 3+ hour train ride from Warsaw. However, like Warsaw, there isn't much to do there, and I would recommend spending at most 2.5 days here. I stayed at One World Hostel which is located near the train station (Krakow Glowny) and is one of the best hostels I have ever been to.

First 0.5 day can be used to explore the Main Market, Old Town, Wawel Castle and the Jewish Quarter. The Old Town and Main Market can be covered within a few hours, and there's only Synagogues to see in the Jewish Quarter. Wawel Castle deserves a walk around the castle to get a bird's eye view of the area.

Day 2 can be used to visit Auswitch. This used to be the biggest concentration camp in the world during the Holocaust. It is a depressing place and a shocking experience that makes you wonder what the hell was going on in Hitler's brain when he ordered the extermination of the Jews. 

 Next two pictures are places where the gas chamber used to be. The people were made to strip in the first picture and then squeezed into the second where they released the gas and suffocated them all to death. Apparently they packed around 2,000 people into the chamber each time. After that, there is a furnace just next to the chamber where they burn all the bodies. It is disgusting how they streamlined the process as though they are assembling a car.

Day 3 can be used to visit the Salt Mine, but I opted not to go as it did not really interest me. Still, you can check it out!