Some of Klimt's central works can be seen in the Leopold Museum, including "Death and Life", one of the great allegories he created. Particularly worth seeing: the current permanent exhibition "Vienna around 1900" with all the pioneering artists of the turn of the century in Vienna.
The Belvedere has the world's largest collection of Klimt's oil paintings, as well as some of the most important portraits of women with which Klimt earned so much money. But the most significant work: "The Kiss (Lovers)" from his golden period is THE Klimt highlight in the Upper Belvedere.
Klimt was co-founder of the Secession as an association for the visual artists of his time in Vienna. In 1902 Klimt created the "Beethoven Frieze" for the 14th official exhibition of the Secession. People who look at it open-mouthed today have the impression that it was painted only yesterday. The colours are so amazing!
The Albertina in Vienna holds 170 drawings from all of Klimt's periods, plus the Klimt archive with letters, photos and postcards. He often wrote several times a day, especially to his long-term partner Emilie Flöge.