It's kind of insane how vast the world, and everything humans have built on it so far is.

Take those ~1800 trains running simultaneously in the middle of the day in Germany. Each one weighs like dozens of tons and carries up to hundreds of passengers.

Now multiply that several times for all the trains running simultaneously in the middle of the day in all of Europe.

Then look at countries like Russia or China that completely dwarf Europe when it comes to [actively used] rail networks.

The US alone has 220 thousand kilometers of railroads. That's more than half of the distance from Earth to the Moon. Add China's 160 thousand and it'd be enough to take a train all the way to the Moon.

And this is only trains.

Maybe it's just me, but... where did all of that come from? Absolutely stunning.