Porto is a highly walkable city in terms of its compact size and the proximity of its major landmarks, but it is also one of the most physically demanding cities to explore on foot. The city is built on steep hills rising from the Douro River, meaning that walking from the Ribeira waterfront up to the Clerigos Tower or the Aliados district involves navigating very steep inclines and traditional cobblestone streets. While you can reach almost all the famous sites—like the Lello Bookstore, the São Bento Station, and the Bolsa Palace—by walking, you will definitely feel the workout in your legs. For those who find the hills challenging, the city offers excellent "vertical transportation" options, such as the Funicular dos Guindais and the various "Teleferico" (cable cars) in Gaia. Many visitors choose to walk "down" toward the river to enjoy the views and then use the iconic yellow trams or the modern Metro system to head back up. Comfortable, slip-resistant walking shoes are absolutely essential because the "Calçada Portuguesa" (white and black stone paving) can become extremely slippery, especially when it rains. Overall, Porto's charm is best discovered by wandering its narrow, winding alleys, provided you are prepared for a bit of a hike.