The website Atlas of Mutual Heritage contains images of places associated with the Dutch East India Company (VOC) and West India Company (WIC). These include trade posts and former colonies in Africa, Asia, Australia, and North and South America. For some of these places, the VOC and WIC archives contain the oldest surviving records and images.
You can navigate the website by clicking on places on the map, or by searching for place names in the top left corner.

View of Elmina, the headquarters of the Dutch slave trade in East Africa, 1706. Credits: Nationaal Archief, 4.AANW 1568 (public domain)
I would like to know, how many Fort Zeelandias were built by the Dutch since the 16th century? Where were the exact locations. I found three : Anping, Tainan, British Gayana and Suriname.