The Martinitower in Groningen, The Netherlands.
Thanks Bas!

I bought a few of this cards to sent around the world, to Russia, Finland and Japan (via a round robin).

Ofcourse I couldn't resist keeping one myself :-)

At this card you can see the Skinny Bridge (= Magere Brug) in Amsterdam, I really love Amsterdam,

it's such a beautiful city!!!!

Bought this card on the www...

Here you can see some of  'our' famous and beautiful Dutch mills!
These are situated at Kinderdijk.
They are drainage-mills of the Kinderdijk-complex, polder "The Overwaard".
Type: Octagonal thatched ground sail mills
Radius:  28.60 metres / Building year : 1740

What an amazing view!!!!

I bought this card, it's the Euromast in Rotterdam (the Netherlands).

The Euromast is a tower in Rotterdam constructed between 1958 and 1960, designed by Hugh Maaskant. It was specially built for the 1960 Floriade. It is a concrete building with an internal diameter of 9 meters (30 ft) and a wall thickness of 30 centimetres (1 ft). For stability it is built on a concrete block of 1,900,000 kilograms (4,190,000 lb) so that the centre of gravity is below ground. It has a "crow's nest" observation platform 96 meters (315 ft) above-ground and a restaurant. Originally 101 meters (331 ft) in height it was the tallest building in Rotterdam. It lost this position for a while, but regained it when the "Space Tower" was added to the top of the building in 1970, giving an additional 85 meters (279 ft). Euromast is a member of the World Federation of Great Towers. (Wikipedia)

The lighthouse at 'Schiermonnikoog' by night. (in 1977)

Schiermonnikoog is an island, a municipality, and a national park in the northern Netherlands. Schiermonnikoog is one of the West Frisian Islands, and is part of the province of Friesland.
The island is only 16 km long and 4 km wide and is the site of the Netherlands' first national park. The only village on the island is also called Schiermonnikoog. Just under 1,000 people permanently reside on the island, making the municipality the least densely populated in the Netherlands. Because the island is small and flat, only 200 islanders have taken out the special licence allowing them to keep their own car, which the result that the few streets are virtually car-free.
Up to 300,000 people visit the island every year, staying in the 5,500 beds available in holiday homes, apartments and hotels. Most visitors, however, are day trippers (about 4,000/day in July and August alone), with the result that after the last ferry leaves at 6.30pm, calm returns to Langestreek, the village high street.
(Wikipedia)

Thanks Dick in Drachten for selling me this card!