This one's definitely for fans of architecture - take your kids on this trail at your own peril! The modernism movement was actually quite strong in Katowice during the interwar period of the 1920s and 30s, and beyond Gdynia, it was actually Katowice which was a bit of a hub for this functional movement, with buildings built which ranged from churches, public buildings to private residences. Starting in the city centre, you work your way outward (but not too far) and take in 16 buildings over a total distance of 5.5km, where you'll see highlights such as the Silesian Parliament to Katowice's very own 60m high cloud scraper (come on, it was considered huge when originally built!). We fully recommend getting yourself a leaflet with map from the city information office on the corner of Katowice's Rynek.