Discover Helsinki with these 5 amazing places. Start with Helsinki Cathedral , a beatiful white church in Senate Square , one of the city`s most famous landmarks. Next , explore Suomenlinna Sea Fortress , a historic site with old walls, museums and great sea views. visit the Ateneum art Museum to see famous Finnish and International paintings. For fun and excitement , go to Linnanmäki amusement Park, the oldst and most popuar theme park in Finland. Finally , you can relax at Esplanadi Park, a lovely green spae with cafes,shops and live music in rhe summer.