Somewhere you know so well you can walk it in your mind without effort — almost always your own home.

The palace only works if the place is already rock-solid in memory, so all your effort goes into the images, not into remembering the building. Best first choices:

• Your home — the gold standard; you know every room and object.
• A childhood home, your workplace, your daily commute, a familiar shop.

Avoid places you've only seen once or invented from scratch — you'd be trying to memorise the palace and the content at the same time, which defeats the purpose.

Walk a single, natural path through it in one consistent direction, never crossing your own trail.

Decide a fixed journey — e.g. front door → hallway → living room → kitchen → bedroom — and always travel it the same way. Rules that keep it reliable:

• One direction, no doubling back or teleporting between rooms.
• A natural walking order (the way you'd actually move through the space).
• The route should feel obvious, so re-walking it never makes you hesitate about "what's next".

Consistency is everything: the same path every time is what guarantees the same order every time.