I was able to obtain 3d-printed markers on shapeways. They are translucent plastic. Very small, but with good detail.
The Capital Set (all nations) is $25 USD and includes the following:
Germany - Reichstag Building
Japan - Imperial Palace
Italy - Coliseum
U.K. - Westminster Palace
U.S. - Capitol Building
U.S.S.R. - St. Basil’s Cathedral
FEC - Taj Mahal
ANZAC - Sydney Harbor Bridge
France - Eiffel Tower and Arc de Triomphe
When I bring them out for a game, folks are always impressed.