High above the 18th- and 19th-century buildings of the Old Town, Trenčín's mighty castle has all the dark foreboding you'd want from a medieval fortress. Today's form dates from around the 15th century, but the city dates back much further. Roman legionnaires were stationed here (they called it Laugaricio) in the 2nd century AD: you can read the inscription that's carved into a cliff in Trenčín to prove it! Afterwards, enjoy the sidewalk cafes and lively nightlife fuelled by the town's university population. The entire centre – including two large, interlocking pedestrian squares – is easily walkable.