Slavery. People always talk about slavery like it's something that only existed in 19th century America as if it wasn't happening right now everywhere.
People seem to think they lived mostly or entirely in the 1800’s. The fact that Rick Wakeman of the rock bands Yes and The Strawbs had once pushed Dalí offstage in 1970 is such a weird overlap of eras.
France used the guillotine for the last time in 1977.
There is still one Blockbuster store open, located in Bend, Oregon.
It can be argued that the Roman empire didn't truly end until WWI in 1918, 106 years ago.
The fall of the Byzantine Empire (aka the Eastern Roman Empire) resulted in a number of subdivided but diplomatically aligned states. By the end of the 19th century a number of European powers were still vying for some claim to the lineage of the Roman Empire (and the Emperor title). But as consequence of the war, the German/Prussian, Austro-Hungarian and Ottoman empires we're all dismantled (and France was out or the running because of the revolution) so every entity with a claim was dead or out of power for the first time since the 11th century.
Nixie tubes - those vacuum tubes that display a single digit or character on glowing wires - were commonplace in the 1950s and 60s but were superseded by LEDs. They're still made in the Czech Republic, bought mostly by hobbyists to build retro gadgets. I have a few myself that I haven't gotten around to using.
Audio CDs are still around. While they're surely not the medium people listen music from, they will most likely be on the merch table at the next concert you go to.
The iPod was discontinued in 2022. I'm guessing there's already a lot of kids who have no idea where the term "podcast" comes from.
The Famicom Disk System, which uses a kind of floppy disk for the Japanese market NES, had kiosks where you could copy games onto disks. The last of those kiosks were removed in 2003
It overlapped the Game Cube.
Leaded fuel. Avgas is 100-octane leaded gasoline that is still being used by most small aircraft piston engines. Lead-free alternatives exist, but production and supply infrastructure is nonexistent.
Up until 1997 rape within a marriage wasn't defined as a crime in Germany. Because it was specifically defined as an act outside of marriage. Our (probably) next chancellor Friedrich Merz voted against the bill that finally made it a crime!
In MLB, the National League and American League didn't have unified rules until 2022, when the National League finally adopted the designated hitter rule.