The charts I found were too Americano-centric. I and a milliard (not billion) other people live in Europe, so we have no idea what some thousand feet is unless we pull out a calculator, and since the coronabullshit, travel is a huge pain in the ass for those who don't have a face mask fetish and have fear of needles. So I have chosen familiar European cities, towns, mountains and lakes as examples instead. Altitudes for cities and towns were taken from Google Earth at what I thought was a fairly major square in the general area of the historic center. Naturally, some cities are quite hilly, some are even in a valley. Because of the Alps being mostly located in German-speaking countries (apologies to francophones, Italians, and Slovenians), most of this table is in fact in German. In higher altitudes where the Alps don't reach, there's a decent amount of Spanish due to the Andes. Supplemental mountains for Western Slavs are at the bottom.
Nautical miles (1.85185 km) seem to make more sense than kilofeet (328 m) or "regular" miles (1.60944 km, close to phi), since they were derived similarly to (kilo)meter by splitting the meridian circumference, but in 360° x 60' = 21600 parts instead of 40000. Probably should be called geominute. Following the base 60, a geodegree could be 111.111 km, nautical chain or geosecond could be 30.8642 m (somehow a shackle of 0.015 nmi or 27.777 m exists) and nautical foot or elbow or geojiffy could be 0.5144 m, but people somehow mashed it with decimal and made cables (1/10) and fathoms (1/1000) and tried connecting it to imperial units. DMS coordinates are still better than MGRS, MapCode, PlusCode, What3Words, C-Squares, GEOREF, GARS, Maidenhead or other letter nonsense. Coincidentally the Blue Marble image has 21600 x 2 = 43200 lines and also 4K and 8K resolutions have 2160 and 4320 lines respectively. Decimal degrees are quite meh, just like cables and fathoms. How about radians, though? That would make a georadian equal to 6.36619 Mm, which is just about the radius of 6.378 Mm.
The effective oxygen level seems to halve every 5.5 km or 18 kft, as does the pressure. However there's the Amstrong line at around 19 km or 63 kft, where the pressure is so low that the body fluids at 37°C or 100°F or 310 K just start to boil, so the ability to breathe pure oxygen at ambient pressure as if there were 9,12176 % sea level pressure oxygen like on top of Huarascán or Ojos del Salado doesn't matter. Normally there's 10.9628x lesser pressure than at sea level or effectively 1,906445 % of oxygen. On the opposite side, down at the Dead Sea shore, the pressure isn't that much higher than at sea level, like in a serious anticyclone, with extrema around 108 kPa. In the Kola superdeep borehole, you wouldn't fit anyway.
Also, instead of buying or renting some expensive altitude training devices, just go mountaineering straight away to some of the more "pathetic" mountains, maybe book a vacation thereabouts. You'll get way better views, and mainly you get to breathe actual fresh air with the smell of forests, which is more relaxing and less claustrophobia inducing.
Alternatively, once someone manages to build the Ultima Tower, X-Seed 4000, or Tokyo Tower of Babel, you can use various floors in these. However it's likely that the highest habitable floor will be at most 8 kft or 2.4 km high, exactly as Dubai City Tower, as that is the cabin altitude limit for commercial airplanes. Meanwhile, people casually live in Bolivia's capital La Paz at 3.6 km or 12 kft and La Rinconada at 5 km or 16 kft, so I would raise the limit to that instead, which would allow flying in the valleys of the Tibetan plateau, should depressurization occur, giving a very scenic view. The passengers should be safe with around half of the sea level oxygen, since they're just sitting in their seats, not playing European football (known as soccer in 'Murrica) as evidenced by the playgrounds in La Rinconada.
Original sources:
https://hypoxico.com/altitude-to-oxygen-chart/
https://milehightraining.com/altitude-to-oxygen-chart/
https://www.higherpeak.com/altitudechart.html
https://isramar.ocean.org.il/isramar2009/DeadSea/LongTerm.aspx
+ Wikipedia, Google Earth, and some school atlas
Dereše 2004, Chopok 2024, Ďumbier 2043, Hlúpy 2061, Volovec 2063, Smreczyński Wierch 2068, Łysanki 2085
Rysy 2503, Vysoká tatranská 2547, Ľadový štít 2627, Lomnický štít 2634, Gerlachovský štít 2655
Ciudad de México 2235, Sana'a 2240, Thimphu 2300, Addis Ababa 2310, Asmara 2350
Quito 2780
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