I will be staying at the above areas from few hours to overnight (except for Istanbul). I was wondering with the time it takes to go to customs, get out of the airport and get back to the airport in time for the next flight, what are the things I can do at each location? I have never been to any of these places. Thank you

@ BRU, arrive 6:40am, depart same day @ 4:10pm
@ VIE, arrive 5:50pm, depart next day @ 1:30pm
@ ZURICH, arrive 3:50pm, depart next day @ 12:35pm
@ AMSTERDAM, arrive 2:10pm, depart next day @ 12:00pm
@ ISTANBUL, arrive 4:30pm, depart 3 days later @ 6:20pm

Once again, thank you very much. I am doing research but since my time is very limited and I feel most of the reviews/suggestions on Tripadvisor is usually lame, I would seek the suggestions of FT.