I just discovered https://www.thecollector.com/ . The article that got me reading it is Gustav Klimt & the Evolutionary Monism of Ernst Haeckel:

Ernst Haeckel, a 19th-century zoologist and proponent of Darwinism developed evolutionary monism, a universalist philosophy that tried to solve the problem of a “mechanic-like” world and surprisingly influenced Viennese art' — Dusan Nikolic, The Collector

Many interesting details about the interaction of the culture, science, philosophy and art of the day.

I perused a few more articles on the site. It has a lot of inline advertisements, but they have to turn a profit. And they seem to be doing OK. Launched in 2019, with lots of interesting material.