What are some must-visit sites in Belarus besides Minsk where good connectivity is useful?

Beyond Minsk, consider visiting the heroic Brest Fortress, a poignant WWII memorial. Good connectivity here allows you to access online guides to understand its vast history. In Grodno, one of the oldest and most beautiful cities, you can use your data to navigate its charming streets and find the best spots to photograph its famous blue-and-white St. Francis Xavier Cathedral.