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The spot can be quite busy during the week (especially around lunch). Best time to log it is probably outside of normal office hours.
||Even though this 17th century "space rocket" is in the middle of the city it is a really quiet part of Stockholm that not a lot of people are aware of.
PLEASE NOTE: This might be a space inspired cache (with some imagination) but remember that gravity still effects the cache. When you replace the cache, give it a good twist so it doesn't fall out
S:t John's web page
(No hints available.)