- Niemeyer had a commission there to build the Hotel do Tijuco (1951) . It is said that he gained inspiration from the arcaded building in the central market square in Diamantina for the Palacio da Alvorada in Brasilia. Niemeyer was a friend of Kubitschek who came from Diamantina and became the Brazilian President who pushed through the development of Brasilia.
So you can take your choice over the logic for a Connection - the inspiration or the actual work - or both! Unfortunately I didn't (knowingly) visit/see any of his buildings when I was in Diamantina but do see a degree of possible inspiration regarding the Market hall which i did see and have included a photo of it in my review on this site.
The evaluation document states :-"Obviously, the modern town emerges as the visitor moves further away from the historic centre. Recent constructions of a high standard, such as those by Niemeyer, have been introduced into the townscape and usually blend harmoniously with it."
For the hotel see http://www.hoteltijuco.com.br/hotel.html
Neither the Evaluation nor the Nomination document includes a town map but the latter includes numerous references to Niemeyer's works in the town - also a School (1954) and a Club (1950). All the implications are that the nomination includes this work e.g :-"Diamantina présente une particularité: celle de superposer l'architecture de Oscar Niemeyer des années 50 de ce siècle, aux interventions architectoniques survenues au XIXè siècle, sans rupture ni désarticulation, ce qui mantient l'unité de l'ensemble naturel."
I think we can take it that they are included
(PS The Neimeyer building in Le Havre isn't an "Art Museum" but a Cultural Centre known as "Le Volcan"! :- "La Maison de la Culture (1978-1982) abrite un théâtre de 1 200 places, un cinéma de 500 places, un vaste hall d'exposition, des salles de réunion et de répétition, des ateliers et des bureaux."
- has (inevitably) a Tree of Lebanon on its front!China
- has the main (?) entrance to the Forbidden City on the frontBelgium
- I understand from Wiki that the "Inside of Passport version 2008 shows town halls of capitals" - A newsletter of the Belgian Embassy in London contains this "The passport's design has also changed, with room made for buildings of symbolic value to the country's regions and provinces, including the buildings housing the staff of its respective minis-ter-presidents, followed by the town halls of the capitals of Belgium's 10 provinces". So a number of the inscribed "Belfries" will be included.