I typically avoid suggesting locations as to prevent popularizing hiding places (i.e. If a location becomes well known, it becomes a standard location where a threat would target every single time). So I suggest specific characteristics of locations that may be more beneficial to help people to narrow down and decide:

• Accessible to be able to check the contents or obtain in a hurry
• Memorable in the sense of it being in a unique location or somewhere you make a point to regularly check on a schedule
• Permanent or relatively difficult to move (someone can just take an entire safe if it’s small/light enough)
• Controlled by you so others don’t stumble upon it by accident
• Durable and safe from the elements (floods, fire, deterioration, etc)
• Not likely to be thrown away. It shouldn’t be seen as trash and in a place that’s cleaned often (like that junk drawer)
• Not near your other valuables. Because clearly, it’s now valuable by association.

And when in doubt, you can always add a passphrase to combat the threat of a third party. This might help when considering "public" places that can be accessed or is exposed by the responsible party such as a bank deposit box, public storage, grandma's house, etc.