Peter K Burian, CC BY-SA 4.0 , via Wikimedia Commons
Porto is a vibrant city with a lot to offer visitors. The Ribeira district is a UNESCO World Heritage Site and is home to many colorful buildings, including the Livraria Lello, a beautiful bookstore. Visitors can also visit the port wine cellars in Vila Nova de Gaia and take a boat trip on the Douro River. Porto is also a great place to enjoy Portuguese cuisine and culture.