One look at the abundance of canals and gabled houses in Gothenburg, and it's clear that the Dutch founded this robust city on the Göta River. Touring the citadel is fascinating, as are the 17th century Crown House, and Gothenburg Art Museum with masterpieces from Edvard Munch to Picasso. Gothenburg is one of Sweden's greenest cities, compliments of parks such as Slottsskogen. For a vibrant atmosphere, walk along Kungsportsavenyn, Gothenburg's main street, lined with cafés, boutiques and plazas.