Firstly, it's not correct to just dump everything old into a "shistory" category. There are plenty of ancient things that are amazing and cannot be reproduced today. Artifacts that have survived so long usually do so due to their high quality, either physically (pyramids) or intricate enough to be carefully preserved (crowns and other jewelry).
Maybe not stone-age artifacts, but musical instruments can be several hundred years old, and cost an absolute fortune. The same with paintings. For some cases it's the particular craftsman, painter, sculptor who has never been equaled since. Mostly its that the market for quality goods is no longer viable for individual artists.
If you look at modern mass-production methods, it's all about reducing item production cost to maximize profit. A good product can be initially launched to a reasonable price, as novelty sells, but as time goes by, the production gets optimized, replacing expensive parts with cheaper ones, skimping on quality control tests, and using cheaper methods of assembly. The actual quality gets shaved off, and the saved cash goes in the company pocket. Companies also make more if the product needs to be replaced, too, so there's little in it for them to build solid, lasting, high quality products. This is known as designed obsolescence.
Work done by individuals, or boutique companies cannot compete on price, availability, time-to-market, or just marketing and advertising in general, so we see a massive change in how goods are actually produced.
Industrial production in capitalistic society is a recent invention, and has caused a massive decline in handcrafted work. Prior to a hundred years ago, goods were always hand crafted, and the better quality artisans would spend their life perfecting their craft, and charge more money for their superior quality goods. The absolute cream of the crop would work for kings and noblemen, supported by royal budgets or arts patronages. Quality and prestige were part of the product the customers paid for.
Today, its mostly just cheap Chinese imports that fall apart after a short while, forcing you to buy another. And in today's economic climate, that is the method which works best. The drawback is everything is plastic and shitty, and little of it will be around in 10 years, never mind 1000.
I can think of some other ancient artifacts which have not been equaled, or cannot be produced today. Look at the Book of Kells (https://en.wikipedia.org/wiki/Book_of_Kells) and ask yourself if a team of people could today dedicate their entire lives to hand-coloring a single book (one copy only). It just can't happen today. There are many other examples of religious artifacts surviving over 1000 years, many of which would be difficult to produce today, and impossible to produce in the same way using the same techniques. What about the cathedrals (Notre Dame being in the news recently)... you can't build one of those anymore, it's simply not economically and politically justifiable. Restore it, sure, but build a new one? No way.
Some artifacts are non-physical, and still preserved for thousands of years. There's the story of Christ, or the entire Bible, and whether you believe or not, it should be recognized as one of the more well-known and preserved stories of the last few thousand years. And its in large part due to it being a very good story, and not much has come along to top it. (Romeo and Juliet, 400 years old, many other examples like Little Red Riding Hood, etc)
Other things have also stood the test of time, like Chess and Go, military tactics, discoveries and inventions in mathematics, etc. I wouldn't exactly call them artifacts but they survive because they haven't been bettered.
Finally, the real reason old stuff is good, is that all the old stuff which wasn't good, was not worth saving. History and time have eaten up all the crap, leaving only the shining awesome masterpieces.