Porto

Built in 1110 in the highest point in the city, Sé do Porto, or Porto Cathedral, is a defining landmark of the city, and the most important religious building in Porto. A visit to the cathedral is well worth not only for its historical importance, but also for its remarkable mix of architectural styles that range from Romanesque to Baroque and Gothic, and lastly, for the beautiful views it offers over the city--stretching from the Old Town to the Atlantic coast.

Ponte Dom Luís I (The Dom Luís I Bridge), one of Porto's most famous landmarks, is a 172 metres double-deck metal arch bridge--the longest of its kind in the world--and links the cities of Porto and Vila Nova de Gaia over the River Douro. It is well worth a visit, especially to admire the sunset.

A must-see while in Porto is the São Bento Railway Station. More than just a train station, this place is another architectural jewel, among the many others this city boasts. Built by the Portuguese architect José Marques da Silva in 1900, the São Bento Railway Station opened to the public sixteen years later. Its construction took place on the site that once housed a Benedictine monastery, hence the name São Bento. The architecture has a French Renaissance influence, and even though its facade is already quite impressive, its interior is what leaves visitors truly awestruck. The main hall is beautifully decorated–from the ground to the ceiling — with more than 20,000 "azulejos" (Portuguese tiles), which recount important events of the history of Portugal.

At the Mercado do Bolhão, you will find a bright and vibrant open-air market brimming with fresh produce such as olives, cheese, and freshly baked bread. Known for its lively atmosphere, this is a great way to start the day, grab some breakfast or stock up on supplies for a day of sightseeing.

More than just a bookstore, Livraria Lello is a historical and architectural masterpiece in downtown Porto. Opened in 1906, Livraria Lello & Irmão as it is also known combines elements of Neo-Gothic, Art Deco, and Art Nouveau styles that comprise intricate woodwork, a large stained glass window bearing the bookshop monogram with the motto "Decus in labore" (dignity at work, in Latin), and a remarkable red spiral staircase, which starts as one set of stairs and splits into two that join in a circular design. The latter is a huge attraction here since it resembles the Grand Staircase from the Harry Potter films, and considering J.K. Rowling was once a Porto resident, there is a high chance this place might have inspired her. Livraria Lello became so popular with tourists that in July 2015 the store started charging a 5 Euro entrance fee and queues can take over an hour. You can purchase tickets on their website.

Medieval tower discovered during the demolition work of several buildings around the Sé Cathedral and then reconstructed 15 metres away from its original position. Today, this restored and fortified medieval tower is home to the Porto Tourism Office.

Currently the headquarters of the municipal company Águas do Porto, hence its second name Parque das Águas (Water Park), the Nova Sintra Park is one of the largest green spaces in Porto, boasting great botanical diversity, dense trees, as well as a peaceful atmosphere--a nice place to relax and take a break by one of its many fountains.

Known as the Venice of Portugal, Aveiro, located 57 km to the south of Porto, is a charming town surrounded by beaches, lagoons, and beautiful canals that run through it. It is easy to reach Aveiro: several trains leave Porto to Aveiro every day, and the journey takes about an hour.