The NAP a.k.a. Normaal Amsterdams Peil (Amsterdam Ordnance Datum).
The NAP has been set in 1700 being the high watermark of the Zuiderzee and act as the bases for the constructing of Dutch buildings ever since.
One of the oldest marks is still visible at the Eenhoornsluis in the Korte Prinsengracht. The stone reads: ‘Zeedijks hooghte zijnde negen voet 5 duym hoven stadspeil.’ This is the only remaining indication from the former ones in the eight locks.
In 1956 a pole was driven into the earth beneath the DAM square with a bronze knob on top indicating 1.43 meter above NAP. This knob is located 90 centimeters below the pavement and the hole is covered with a lid.
In the basement of the Amsterdam City Hall (Stopera) there are three water columns representing:
-The Northsea tide at IJmuiden
-The tide at Vlissingen
-The highest level reached during the flood of 1953 (4.55 meters above NAP).
The columns are designed by Louis van Gasteren and Kees van der Veer and inaugurated in 1988.
Winter: Th-Sa: 10AM - 5PM
Spring & Fall: We-Sa: 10- 5PM
Summer: Daily: 10AM - 5PM
Admission: Euro 4.--.
You can never be sure what you might find in the flea market at Waterlooplein---take your time, do not be in a hurry and you might find a really cool item.....I have found erotic prints, Lourdes collectibles, books and comics, and all sorts of goodies here....
The NAP project is the country's way of measuring a Sea level equivalent for the Netherlands. They have a display in the Stopera complex that shows Sea level with low and hide tide relative to the canal level in Amsterdam. You can look and see how below Sea level you are at any given time
The Waterloo Plein is the venue for the most famous Flea Market in Amsterdam.
Nearly everything you can imagine is on sale here.
There are a lot of clothes stalls and also many selling the usual market items i.e. hardware, tools, etc.
However there are many bric-a brac stalls which are quite interesting.
There is also a huge amount of "junk" for sale. God only knows what use some of it could be to anyone.
Yet the whole experience is great fun and not one to be missed.
If it wet or windy the stallholders don't set up. Try for a dry and calm day.
Monday to Saturday!.
Nothing there on Sunday!
The large famous fleamarket around the Stopera (Amsterdam opera and town hall).
Probably more interesting than the stuff on sale are the people that walk about here. Just have a good look at the stall owners. You will find many colourful figures!
Many years ago I bought some Schiaparelli sunglasses (were they fake?) on Waterlooplein. Red ones. Worn them endlessly! I must've lost them because I never throw things away (awful habit).
Take the free ferry behind central station to the other side of the IJ and go for a walk along the North Holland Canal.
Waterlooplein market (at the Waterlooplein).
Go up the tower to the cafe in the Kalvertoren shopping mall, and admire the view
Go to the cafe in Metz and admire the view
Visit the Waterlooplein
Amsterdam's most famous flea market, Waterlooplein offers a bewildering variety of goods, from household junk to pseudo-antiques. Clothes -leather jackets, jeans, retro stuff and hippy T-shirts- make up a sizeable portion of what's on offer. There's jewellery, sunglasses, and hats too. Probably more worth it for the experience than any great buys, though.
Visit the fleemarket at Waterlooplein
Lots of stuff, great to have a look round
Waterlooplein is a cool square in the old center with a flee market. Loads of cool (second hand) clothing and other gadgets.