Do you have "nanoblock" in the U.S.? They're these made-in-Japan LEGO-type bricks, but significantly smaller. According to the nanoblock website, the world's smallest blocks. Their small size means greater detail.
Check out a nanoblock review here.
Here is a photo I took in a toy store of nanoblocks constructed to look like famous landmarks. It's hard to get a sense of scale, but you'd need tweezers to put these things together.
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