Some things Outside my Windows are man-made.
This is a view of my amateur radio antenna and tower. That is another person at the top. I'm chicken to climb up something like that.
The back element of the beam is about 31 feet. That antenna combined with a maximum legal power amplifier has helped me talk with over 300 different countries.
The concrete base has slightly over five yards of concrete with steel rods throughout.
Sadly, I had the tower taken down and sold, mainly because the trees were starting to grow in toward the antenna.
Amateur radio is great fun, but now you can "talk" all around the world on the Internet. Still, I enjoyed doing it the old fashioned way using a radio station.
Bill