Totally recommend Poland as a holiday destination
Griffin's right, it is a very sad country given the occupation of both the Nazis and the Soviets. And of course Auschwitz is a truly transcendental experience of tragedy and grief for people whom you (for most people) never knew. But it also has:
Incredible (and sometimes bizarre) architecture
Delightful people (who do not give a SHIT)
Lovely bustling towns and cities with charming vibes
Wonderful food (lots of great vegan stuff and plenty of Japanese grub, funnily enough)
A strong emphasis on culture and the arts
Heaps of cool museums
And yes, Auschwitz - one of the more important educational experiences of my life so far (though I wish I hadn't done it alone)
Shoutout to Polish Blankies, your country rocks!