Visit St. Alexander Nevsky Cathedral
Built in 1900 when the locals were mainly Lutheran, the onion-dome cathedral went up when Estonia was part of the tsarist Russian empire, acting as a way for the occupying government to flex its Soviet muscles.

Built right across the candy pink Parliament building in the square, the Orthodox church was meant to act as a symbol of the empire's dominance and remind the locals just who was in charge. But that was well over a hundred years ago, and today it's one of the city's most beautiful architectural structures you can go into and admire.