Wonders Of The World | Silver Ingots

Hi all,

I need help identifying this coin/bullion.
I am sorry I dont have any pics because they are not mine.I have seen them at a silver shop.

Description;

1.They are rectangular proof silver coins or bullion.

2.On one side the wonder is engraved.

3.On the other side the following is written:
Wonders Of The World. Limited Edition 0.800 Fine Silver
Gauranteed 400 grains. The name of one of the wonders e.g. The Hanging Gardens of Babylon

I have searched ebay and google but nothing matched.
I dont know anything more than that and sorry again for no pics are available.

Help Please

Thanks


Edited to add this:
There was no denominations on it.
The dealer has three of them;
one is for [The Sphinx and Pyramids], the other is [The Hanging Gardens of Babylon] and the third was [Taj Mahal].
He told me that he is collecting them, and that they are seven.
He bought them separately from customers, and he asked me to help him know more about them.