Zek Sora
Donor
Abandon The Big Ben
Make a map of the spacious and permanent relocation of a national capital. Up to this point, the country shall not have had an own historic precedent for this endeavor and the abandoned capital shall have the status of an undisputed primate city in its country.
(TL;DR: Monocentric countries with big heads as capitals that don't create a New-World-style planned city but use a grown city in another part of the country to grow organically into a new capital city.)
I like this, but would prefer to make it a little broader; i.e. just "make a map of the relocation of a national capital".