6th PanAfrican Prehistory Congress September 10, 2018 1967 cachet Central African Republic lithic megalith + ofdc 1967 cachet Central African Republic lithic megalith ofdc
Ring of Brodger September 30, 2017 2011 aerogramme Great Britain megalith unesco + UniversalMail 2011 aerogramme Great Britain megalith unesco UniversalMail
Avebury April 09, 2017 2017 Great Britain megalith Neolithic ofdc PHQ postcrossing + unesco 2017 Great Britain megalith Neolithic ofdc PHQ postcrossing unesco
Drenthe June 29, 2016 2016 megalith Netherlands personalized + postcrossing 2016 megalith Netherlands personalized postcrossing
Spellenstein April 29, 2016 2016 cancel Germany megalith +0 Neolithic 2016 cancel Germany megalith Neolithic
Orkney Universal Mail December 17, 2013 2011 Great Britain megalith unesco + UniversalMail 2011 Great Britain megalith unesco UniversalMail
San Agustin September 30, 2013 1952 1979 Colombia megalith +0 unesco 1952 1979 Colombia megalith unesco
Danish Dolmens October 01, 2012 1962 1966 2007 ATM Denmark megalith + ofdc 1962 1966 2007 ATM Denmark megalith ofdc
Pret a Poster August 07, 2012 2014 France megalith +0 postal stationery 2014 France megalith postal stationery
Volkonskiy Dolmen July 13, 2012 2011 megalith postcrossing +0 Russia 2011 megalith postcrossing Russia
Royal Geographic Society April 23, 2012 1980 Isle of Man megalith Neolithic +0 ofdc 1980 Isle of Man megalith Neolithic ofdc
Chianca Bisceglie Dolmen February 02, 2012 2007 Italy maxicard megalith +0 ofdc 2007 Italy maxicard megalith ofdc
Guernsey Dolmens November 19, 2011 1977 2007 2016 Guernsey megalith + ofdc 1977 2007 2016 Guernsey megalith ofdc