When you keep visiting shrines and temples in Japan many times to collect their seals in an accordion book as shown the above will become into your treasure which is mysterious and artistic book like ancient manuscripts.
Goshuin 御朱印 is a seal that is historically given if you wrote and submitted sutra copies at a shrine or a temple a long time ago, but after some time, instead of performing the ritual you can donate... actually buy the seal at many shrines and temples.
Each shrine or temple has their unique seal.
You can choose from 5 colors below.
Goshuin-cho of Kotohira-gu Shrine 金刀比羅宮
It looks good!
In Tokyo, this shrine is good for sightseeing.
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