3 Must-See Hop-off AttractionsIf you only have a day or two to spend in this wonderful city then make sure you visit these 3 must-see attractions. First is the Warsaw's Castle Square at Bus Stop 6 on the Blue Line. You will be truly dazzled by the array of colourful buildings and the vibrant energy of this town square. On the Red Line at Bus Stop 6B you'll see the magnificent Library of the University of Warsaw, it's intricate detailed gates make it hard to miss and it really is the centre of this city's culture and history. Hop-off at Bus Stop 8 to take a walk around Warsaw's largest park, the Lazienki Palace and Garden, which is surrounded by water and trees.