I think about maps a lot, and I'm underwhelmed and unimpressed by a lot of them. Here's one I quite like – world city populations, by luminocity3d. It's always interesting to me to pay attention to the white areas – western China, the Sahara, etc.

(Also – upcoming cities)
I'd be curious to overlay this map of cities with the worldmap of rivers:
https://twitter.com/terriblemaps/status/994336826218467330?s=21
https://twitter.com/biologypartners/status/995315526883721216?s=21
https://twitter.com/simongerman600/status/996142615841124352
https://twitter.com/visakanv/status/988020573878927360
https://twitter.com/visakanv/status/921441279510114304
our world in 250,000,000 years – if our descendants are still around, geopolitics will be very different https://twitter.com/simongerman600/status/1004020023357304832
https://twitter.com/terriblemaps/status/1009198177810075649?s=21
https://twitter.com/visakanv/status/996272715232198657?s=21
https://twitter.com/sasha_trub/status/1000891076931215360?s=21
50/50
Topography https://twitter.com/devonzuegel/status/1012159191081934848?s=21
https://twitter.com/simongerman600/status/1012352437259300864?s=21
😂 https://twitter.com/ohnoobderp/status/1014461661564923905?s=21
Kinda spooky (h/t @seculartaoist) https://twitter.com/geoviews/status/1015219086622588928?s=21
Geography, politics, religion and school lunches https://twitter.com/misraudit/status/1015863613070958592?s=21
Thx @a_xenop for sharing https://twitter.com/factsbalkan/status/845692675068248066?s=21
https://twitter.com/devonzuegel/status/1017182086778613760?s=21
Parking in NYC https://twitter.com/devonzuegel/status/1019352015913213952?s=21
I’d love a Google Maps plugin or mode that allows you to toggle 90s CGI https://twitter.com/ageofnapoleon/status/1020466546974646273?s=21
cool thread about the history of New York https://twitter.com/chazhutton/status/1020295040864833536
Land use https://twitter.com/juliagalef/status/1024918230433845249?s=21
the sweet potato odyssey https://twitter.com/Botanygeek/status/1025073011437838338
UK musical artists https://twitter.com/brilliantmaps/status/1027158303212752896?s=21
Various past empires in Asia https://twitter.com/visakanv/status/1026383605239406593?s=21
Supposed US equivalent of best selling artists by state of birth. Feels a bit confusing because people don’t buy records these days the way they used to... I don’t recognise some of these artists. Linda? Nicolette? Spencer? Dwight? Brad? Mannheim?
sobering https://twitter.com/simongerman600/status/1029104063135330304
https://twitter.com/seshatdatabank/status/1030718709592141824?s=21
https://twitter.com/simongerman600/status/992026048404606978?s=21
Interactive voronoi globe of the world’s airports https://twitter.com/yutakashino/status/1034583760845643776?s=21
If Germany had been broken up according to the Roosevelt plan https://twitter.com/simongerman600/status/1038873457252098050?s=21
If Europe had to be depicted with Tetris blocks https://twitter.com/whyvert/status/1039354779082866689
35. https://twitter.com/simongerman600/status/1040190108782215170?s=21
36. the solar system's solid surfaces stitched together, excluding dust and small rocks (but including "all human skin") http://xkcd.com/1389/ 
37. oceans https://twitter.com/simongerman600/status/1040984848947666950?s=21
38. planetary urban modelling https://twitter.com/sevamoo/status/1046147812252143617
39. time zones in Antarctica
40. Byzantine Empire in 1265 https://twitter.com/romebyzantium/status/1047209623281913857
41. very stylish https://twitter.com/simongerman600/status/988799758780325889
42. https://twitter.com/ohoncharuk/status/1048991792098684928?s=21
43. Rivers https://twitter.com/simongerman600/status/1003260034292346880?s=21
44. Interesting to compare this map of roads with the map of rivers before it
45. I’d like maps of roads and rivers without national and state boundaries
46. Oh this is fascinating! A team at Stanford made a "geospatial network model of the Roman world" – you can play around and check out the travel times! and really cool just to see the old names in a modern interface h/t @simongerman600 for sharing http://orbis.stanford.edu/ 
47. World population, visualized! This is beautiful and illuminating https://twitter.com/puddingviz/status/1055505311585497090
48. travel time in the 1880s https://twitter.com/devonzuegel/status/1056544476494209025
49. gulls https://twitter.com/brookejarvis/status/1028814989681807360?s=21
50. My favourite thing about this map is that you can’t see the national boundaries. I would further remove the nation’s names and maybe put cities down instead https://twitter.com/openculture/status/1069169553186410496?s=21
51. the roads leading to each US state's capital
52. Roads in Great Britain, by /u/jamaps (discovered via @simongerman600)

somebody please make this for an entire continent, *without* national boundaries!

https://www.reddit.com/r/dataisbeautiful/comments/8mylc9/only_the_roads_of_great_britain_oc/
53. also by /u/jamaps – "the world in an isohedral projection with triangular boundary generalization" – a modification of Buckminister Fuller's Dymaxion map http://jamaps.github.io/maps.html 
54. more from /u/jamaps – he calls these "fractal commuting trees" – I believe the color intensity represents how much people travel on these routes? You really see how human movement through terrain forms a sort of pulsing tree structure, like lightning, neurons, capillaries
55. Jackson Pollock paintings. These are maps to me 😂 https://www.jackson-pollock.org/jackson-pollock-paintings.jsp
56. the human cardiovascular system
57. /u/jamaps again – railways of the USA

world railway maps without national boundaries, pls, somebody
58. leaves
59. The art of cartography https://twitter.com/weirdlandtales/status/1086755431911964674?s=21
60. US numbered highway system in numerical order, by /u/tns22x on /r/MapPorn

https://www.reddit.com/r/MapPorn/comments/al3kiy/the_us_numbered_highway_system_in_numerical_order/
61. New Orleans is unrealistic https://twitter.com/jameslsutter/status/975550946884268032
62. At last! I’ve been looking for this for years!! https://twitter.com/onlmaps/status/1154192058766073858?s=21
63. US railroads, color-coded by companies https://twitter.com/380kmh/status/1147164647449137152
64. latitudes https://twitter.com/380kmh/status/1177293386816118787?s=21
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