Just about any building which was made to last and look good, still does
At the turn of the 20th century most buildings constructed were still wooden ones; the stone or brick buildings with ornate architecture were the exception and required a lot of resources to be invested
It was the same in the Soviet era; most buildings were ugly as fk made out of concrete with minimalism or other styles simply serving as an excuse to cheap out. But the buildings there that got individual architecture, themes and quality materials still do stand the test of time - like the 7 Sisters skyscrapers in Moscow.
And it's the same now. The modern architecture projects which look futuristic or interesting, which are not simplified in concept or upon their realization, and which are built to high-standards; are the ones that will look good now, and in 20 years time and in 200 years time.