Near the Stock Palace and the Douro River is another UNESCO World Heritage site that is well worth visit while in Porto, the Monument Church of St Francis, or Igreja Monumento de São Francisco. This church built around the 14th century has one of Europe's most sumptuous and extravagant interiors. Here, all that glitter is, in fact, gold! Its interior is covered in gilded woodwork, and rumour has it that it was used around 400 to 600 kg of gold to decorate it. Hence why the St Francis Church is also known as "The Golden Church". Another highlight of this church is its impressive Tree of Jesse, a wooden sculpture carved by Filipe da Silva and António Gomes in 1718 depicting the ancestors of Jesus Christ, shown in a branching tree — considered to be one of the best in the world of its kind. Under the church, you will find the catacombs, where the Franciscan monks along with the members of Porto's noble families are buried.

Walking tours are great options if you want to quickly orient yourself in a new city within 2–3 hours and meet a couple of fellow travellers. Your Viking guide will make sure you don't walk past any hidden gems and tell you stories of the Vikings, elves and modern-day Icelanders. Some tours might include lunch, others — booze. It's up to you how to stay warm.

A 20-minute drive south of Pristina lies the natural limestone cave known as the Marble Cave, once accidentally chanced upon by a local resident. Despite the research project now being financed by the EU, the cave remains largely unexplored. The entry fee is very moderate and includes a guided tour.