La Llotja de la Seda
You really can’t miss a visit to La Llotja de la Seda, the stunning 15th century silk exchange. It’s one of the best pieces of non-religious Gothic architecture in Europe and it has World Heritage status. Luckily it’s right in the center of the Old Town area so no matter what your plans are it’s easy to fit this in – you’ll probably start using it as a landmark by the end of your trip. It’s definitely worth the couple of euros to go inside to see the amazing interior, with columns representing tall palms reaching for the sky. Outside you could spend hours discovering all the weird and wonderful gothic gargoyles and other stone carvings perched on the walls, many of them completely bizarre.