Updated: Countries and Cities to visit ...

Africa
Cape Verde islands - stay a bit longer this time
Botswana
Ethiopia - including the mountains
Libya - Roman ruins, and desert
Madagascar - lemurs permitting
Namibia - including Okavango Delta, Kolmanskop ghost town
Zimbabwe - including Victoria Falls

Americas
Brazil - Rio including Fasano hotel infinity pool, Niteroi art gallery, grilled steak at Rubaiyat restaurant; Amazon
Canada - including polar bears
Colombia
Costa Rica - done!
Cuba - including Havana and Vinales - done!
Equador - Galapagos
Mexico - Mayan stuff around Cancun
Panama - including canal
Peru - Inca Trail / Machu Pichu
USA - including Washington DC (done!), Grand Canyon (done!), Boston - including Opera House, Chicago - including Frank Lloyd Wright buildings (such as Fallingwater), Denali NP, Total Solar Eclipse Aug-17

Venezuela - maybe a tepui

Antarctica
The Peninsula - done!
South Georgia - done!


Asia
Armenia
Bhutan
Georgia - including the soviet architecture in Tbilisi

Indonesia - including Borneo
Iran - including Isfahan and Persepolis, Tehran - including Contemporary Art Gallery

Japan - Hashima Island near Nagasaki, Yokohama
Laos

Lebanon - including skiing

Malaysia

Philippines
Kuwait - to fill in the gaps
South Korea
Sri Lanka - including blue whales
Syria - if there's anything left
Thailand
Turkey - Istanbul
Vietnam


Australasia
Australia - Tasmania, Western, Central and Northern, GBR
New Zealand - all


Europe
Aland Islands - done !
Austria - Vienna - including Opera

Azores - maybe this walking trip or this self guided one
Belgium - Antwerp - including 5 Continents house
Croatia - including Zagreb
Cyprus - including border area and countryside
Denmark - Royal Danish Theatre in Copenhagen
Finland - the lakes, the north
France - Corsica; the bridge in the sky; Matisse chapel at Vence; Lille; Chateau de Chambord - for the double helix staircase; Versailles - including the Royal Opera (done!); Nice - including Opera; Paris - L'Acajou restaurant, Jazz Club; Roubaix - including La Piscine museum; Ronchamp - Le Corbusier's chapel of Notre Dame du Haut; Chamonix - nice looking hotel; Noirmoutier including Plages des Dames - and nearby islands; Oradour-sur-Glane (near Limoges)
Germany - Prora and Dessau, Dresden (including the Royal Castle), and Hamburg (for the funny tunnel, and miniature airport)
Gibraltar - airport and back walk up rock (done!)
Greece - Athens, Mount Athos, island hopping
Ireland - Cork - including butter museum, harbour tour, Titanic Experience, Crawford gallery, Hook Head lighthouse

Italy - Sicilian volcanos, Greek Theatre on Sicily, Poggioreale ghost town on Sicily, Sardinia, Tuscany including Montepulciano, Naples, Verona, La Scala in Milano, Como - La baia di Moltrasio bar and restaurant (try fish with Riso in Cagnone) - terrace in summer, Florence - Vasari Corridor will soon be open, Room of Paradise at the recently reopened Museo dell'Opera del Duomo; Calcata town; Castel Gandolfo (train from within Vatican) - must be booked in advance; French Church in Rome; Palio di Siena ; Craco - far south

Netherlands - Amsterdam Modern Art Gallery and other galleries, a concert at Concertgebouw, Panorama Mesdag in The Hague, Delft, Leiden, Het Loo palace
Poland - medieval cities (Krakow done!)
Portugal - including Oporto
Romania - rural parts (sort of done). Crazy road.
Serbia - Belgrade
Spain - including the Moorish bits, Grand Teatre del Liceu in Barcelona
Slovenia - try skiing
Svalbard - done!
Sweden - Stockholm always worth another visit
Ukraine - Kiev, Chernobyl
UK - Falkirk Wheel, Cramond island, Ironbridge, Ludlow in Shropshire, Norwich for Europe's largest medieval street plan, Chatsworth House, Orford Ness reserve ...