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This impressive 19th-century building next to the Hietalahti square hosted the Helsinki Technical University until the 1950s, nowadays it's the main building for the Metropolia University of Applied Sciences. As you're there, check out the Hietalahti market hall and market square.
© OpenStreetMap contributors
The Alexander theater, named after the Russian czar Alexander II and finished in 1879 is likely Helsinki's most beautiful venue for performance art. Occasional shows and concerts in English.
The centre of the Jewish community in Helsinki; there are also a Jewish school, kindergarten and a kosher store on the premises. You probably have to call ahead for visiting.
Feel creative? Annantalo, a multimodal "house of art" arranges art workshops and courses for both kids and grownups, as well as performances and exhibitions.
Helsingin Vanha Kirkko
A neoclassical wooden church built in the early 19th century, which is the oldest church in central Helsinki. It's in the middle of the Park of the Old Church, which is also known as the Plague Park (Ruttopuisto) because it was used as a cemetery for many of the victims of the plague of 1710.
A tiny little park next to the Old church. In the middle there's a statue of 19th century author and scientist Elias Lönnrot (author of Kalevala, the Finnish national epic).