Jugend architecture is more generally known as Art Nouveau. In Finland you see swooping, flowing lines in the decoration. There are mythological symbols, many from the national epic poem, Kalevala, as well as images of nature, such as owls and bears. There are elements. The most important buildings are in stone, but they also used soapstone, a softer rock. This style was in vogue in the early 20th century.
I’ll post another entry with interior shots- quite fabulous!
Here are some good examples of building exteriors from a two or three block area near the harbor and the Russian Church: