Location: Markt 80 2611 GW DELFT
I think this costs two to four euros per person depending on age. With one ticket you can also go to the Old Church! Guided tours are also offered.
Why you should check it out: If you want to see what a Netherlands city looks like, climb the church! The view is definitely worth the little hike and one of the best sights in Delft. Afterwards, you can sip a coffee (or beer) in the square.

