What is the value of anything, really? The value of a metal brick, or a shiny stone, far exceeds any practical utility of the physical object itself. Even the value of a "real" currency is based, in broad strokes, on what you can exchange it for.
Land to grow crops for food is also valuable for the same reason.
Construction materials to build shelter/homes are definitely valuable.
Some metals and minerals are important to our technology driven society. You need these raw materials to build your technological infrastructure.
Bitcoin? I don't see it ...
The value of bitcoin is its decentralisation. As long as there are people running nodes, the network is alive, regardless of what any government or entity in the planet thinks. Being global also means it’s used by people who do not have a stable money store (countries with unstable currencies), and for transfers between borders that would otherwise be impossible.