There are a lot of options for memory palaces - they need not be physical buildings or buildings at all. Any structure that you can mentally traverse at will, will do the job. And the items to be stored need not be placed in a chamber - they can be attached to any feature.
Parts of your body
Your vehicle
An item of clothing
Any item with enough parts - your phone, bicycle, pocket knife, kitchen range
A fantasy scene that you know well
A simple story
A song
You can invent your own fantasy structures, draw them or construct with software
For further ideas:https://forum.artofmemory.com/t/miniature-memory-palaces-including-your-palm/28864