North - Vassenden, Norway
South - Aruba
West - Kitsap Peninsula, Washington State
East - Bar Harbor, Maine
North: Reykavik Iceland, 64N
South: Western Region Ghana 5N
East: Dover UK 1E
West: Big island Hawaii 156W
I’ve crossed all meridians from Incheon, Korea (126E) going eastwards to Ephesus, Turkey (27E). I’ve crossed all lines of latitude from Cebu, Phillipines (10N) going northward to Skagway, Alaska (59N).
Furthest S and E: Sydney, Australia: 33^o,37’ S, 151^o,12’ E
Furthest W: Oahu: 138^o W
Furthest N, Sognefjord, Norway: 61^o N.
North, Dawson City, Yukon 64°03′36″N
South, Mcmurdo Station Antarctica 77°50′47″S
East, Gisborne New Zealand 178° 00’ 15.01" E
West Honolulu, Hawaii 157°51′W
Not counting flying over the international dateline, just places I have set foot.
no data
Only counting places I have spent some time as opposed to transiting.
North: Probably Hamburg: 53.6
South: Rarotonga in the Cook Islands -21.3
East: Narita Airport (Tokyo): 140.4
West: Rarotonga again: -159.8
Grrr. My 20 year old son has me beat on three ordinates having been to Syndey, AUS and Longbearbyen in Svalbard.
North: Giant’s Causeway - 55°14’ N
South: South coast of Maui - ~20°30’ N
East: Dublin - 6°30’ W
West: Pearl Harbor - 157°57′ W
I really would like to travel more and more widely. It’s been mostly Disneyland and Maui, with a Caribbean cruise and an epic tour of Ireland as the two “big ones” of my adulthood.
It is a fairly pointless exercise, as it depends on your starting point. One person’s east is another’s west. But as I live just 6 miles from the prime meridian (that’s 0° longitude to you folks) the 180° line does represent furthest east and west for me.
So: North - Helsinki, Finland
South - Dunedin, New Zealand
West - Vancouver, Canada
East - Napier, New Zealand
It is similar for me, as I live only 7° east of the null meridian, the furthest away eastern and western places I’ve been to are in the same directions from Greenwich.
It’s true of anyone who’s never crossed the 180º line, which can be the case even for folks who live well away from the Greenwich line.
North (2022): Fairbanks, Alaska, USA, 64.85N, -147.84W
South (2022): Punta Arenas, Chile, -53.16S, -70.90W (6 mo after ^)
East (1992): Rome, Italy, 41.89N, 12.49E
West (2010): Hanalei, Kauai, Hawaii, USA, 22.20N, -159.50W
The furthest north I’ve been is Anchorage, Alaska, during the winter of 2019/2020 while on TDY.
From there I took a Gulfstream G450 to Shemya Island. That’s an… interesting place.
I almost want to count Scotland even though the OP specifically prohibits traversal by air, but I did see it from a plane and that experience was notable to me because of how many golf courses there were.
North: Nordkapp, Norway, 71.17°N (2014)
South: Melbourne, Victoria, Australia, -37.86°S (2012)
East: Sydney, NSW, Australia, 151.24°E (2012, a few days prior to the one above)
West: Weimea Canyon, Kauai, Hawaii, -159.67°W (2017)
South: bottom of Bonaire about 12.02N
East: Moscow 37.6E
West: I can’t fully remember, I’ve been to Sunnyside, WA, 120W, but I think I might have stayed a bit further west in Oregon on that same trip.
North: Kolka, Latvia, 57.76N. Isle of Skye is close, being about 57.68N.
I’ve driven/ridden a motorcycle from pretty far north in Maine, south to Key West, Florida, west to LA, and Sunnyside, WA. Seems I’ve been east to west driving, on different trips, from Lisbon, Portugal, and Riga, Latvia except for about a degree in France where I’ve never really driven.
South: Esquel, Chubut, Argentina
North: Fiumicino Airport, Rome, Italy
West: Orlando, Florida, USA
East: Marathon Beach, Greece.
North: 90.00°N (Crossed over the North Pole by submarine. We didn’t surface there, but did surface elsewhere in the Arctic and walked around on the surface of the ice pack.)
South: 12.03°N (Southernmost point of Bonaire in the Caribbean Netherlands)
East*: 34.83°E (Göreme, Cappadocia, Turkey)
West*: 158.20°W (Waianae, Oahu, Hawaii)
*However, we circumnavigated the North Pole (and the Arctic Ocean under the ice cap) by submarine and so technically crossed all of the longitude lines, including the antimeridian (and the International Date Line).
Our submarine had a port visit in Tromsø after another Arctic mission, but we traveled south to get there. 
Were you on a submarine too? If so, I never realized that (or that you were in the Navy, for that matter).
Yes indeed. USS Tautog (SSN 639) and USS Queenfish (SSN 651) 1983-1987. Both are probably razor blades now.
Nice! I was on the USS San Juan (SSN 751), which was the first 688-class submarine to surface through the ice up in the Arctic (which happened while I was onboard). She was pretty new when I was onboard over 30 years ago, but I believe she is now in the process of being decommissioned.