after seeing this mentioned several times by Scorfman..I finally looked it up..
'Goshuin (御朱印) are seal stamps given out at many Buddhist temples and Shinto shrines across Japan. Each goshuin is a unique work of art, consisting of the shrine or temple's name in black ink calligraphy, a distinct red seal representing the location, and the date of the visit"
Assume these and other stamps mentiined are part of a trip collection?