We know what you're thinking: a library under 'entertainment??' But though the Warsaw University Library is intellectually stimulating and architecturally brilliant, it's the botanical garden on the rooftop that's one of our favorite spots in the city (and provides one of the best views of the city). It's only open until sunset in the warmer months (and until 3 pm in the winter), but not much can beat laying in soft grass or sitting on one of the smooth metal benches and watching the Warsaw skyline in the background while listening to the rooftop stream and the students trickle by.
"by far my favourite place in the whole city - in the summer, i could spend the whole day laying around in the grass. the architechture and design of the whole place is breathtaking!"