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I love that about CRTs, man.
How the fuck could we invent a tiny pocket sized particle accelerator electron beam gun that magnetically aimed its fire with such precision as to hit every individual phosphor, with the appropriate charge to make the right color, across an entire fucking screen, and do that 30+ times a second (for TV, or 60+ for a monitor)..
Yet the LCD is the high tech fancy monitor when its just a little grid of globs being electronically fired? How did the CRT get invented before the LCD?!
Bicycle shifters.
The first iteration that could be operated without stopping was the Campagnolo Cambio Corsa.
To shift, you had to reach behind you, where there were 2 levers.
The first one loosened the rear axle so it could move freely back and forth in the dropouts.
The second one had an eyelet you could use to move the chain sideways.
You put the chain on a different cog, and the rear wheel jumped forward or back due to the changed chain length.
Then you tightened the rear axle again.
It's terrifyingly beautiful:
This sounds like a gadget specifically designed to make people fall off their bikes and break their bones.
......... Cool.
To make sure I understand, you reached back and grabbed those levers while pedaling and riding the bike?
How many people lost fingers by sticking them into the spokes, I wonder?
Automatic watches and grandfather clocks. The way they kept track of time using only mechanical principles is crazy. How does my automatic watch recharge itself using only the movement from wearing it and keep accurate track of time. Grandfather clocks are cool because they're so power efficient.
Any mechanical regulation process that used to be handled by actual machine parts. Think of the centrifugal governor, this beautiful and elegant mechanical device just for regulating the speed of a steam engine. Sure, a computer chip could do it a lot better today, and we're not even building steam engines quite like those anymore. But still, mechanically controlled things are just genuinely a lot cooler.
Or hell, even for computing, take a look at the elaborate mechanical computers that were used to calculate firing solutions on old battleships. Again, silicon computers perform objectively better in nearly every way, but there's something objectively cool about solving an set of equations on an elaborate arrangement of clockwork.
Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and the advent of much cheaper, more sophisticated, and more effective electronic navigational systems.
They were quite important for a long time. We used them for thousands of years, and they're often unique in form, iconic. And they're a good subject for photos and paintings, and I think that the light effect from them is neat. Lots of books and such using them, like ones on remote rocks, to get an isolated setting ("the lone lighthouse keeper").
But the past few decades of technological advancement have probably closed the end of their era.
A nixie tube is a bunch of tiny lightbulbs shaped into numbers in a single pack with different pins each turning on a number.
Clearly the modern number display is better in many ways, but you were asking for coolness.
A lot of older tech had a way more interesting silhouette. You can see this clearly in how many objects live on in icon form. We still often use handset phones, magnifying glasses, gears, or the infamous floppy disk save icon. I think the staying power of these really comes from how ephemeral and formless digital tech can be.