Casco Viejo Walking Tour Casco Viejo is Panama City's old town and a World Heritage Site. As your local tour guide, I will show you the most important buildings, squares and churches of Panama City's colonial district, while you learn about the Hispanic legacy and admire the European and neoclassical art of its buildings. After a brief introduction about the foundation on Panama City by Spain, and the events that led to its transfer to Casco Viejo, we will walk around the town. There will be a stop at one of the local handicraft markets and you will have the opportunity to taste artisan Panama Chocolate (bonbons).