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Photo: Canaan, CC BY-SA 4.0 via Wikimedia Commons
Includes access to underground Roman ruins and a complex of historic buildings in the centre of the Barri Gòtic (Gothic Quarter), and is a reasonably good historical museum.
The Museum of the History of Barcelona is a history museum that conserves, researches, communicates and exhibits the historical heritage of the city of Barcelona, from its origins in Roman times until the present day. The museum's headquarters are located on Plaça del Rei, in the Barcelona Gothic Quarter. It also manages several historic sites all around the city, most of them archaeological sites displaying remains of the ancient Roman city, called Barcino in Latin. Some others date to medieval times, including the Jewish quarter and the medieval royal palace called the Palau Reial Major. The rest are contemporary, among them old industrial buildings and sites related to Antoni Gaudí and the Spanish Civil War.
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This square has two important buildings, the Santa Àgata church, where the kings from the Aragon crown had baptism. Is possible to visit it. The other building has the Saló del Tinell, one of the best civil Gothic architecture examples. Is the place where the royal receptions where held, so is very wide with a wooden ceiling hold by the typical Catalan Gothic arches. It has also a tower from which you can have a good view of the old town. An entrance is needed to visit both.
Barcelona Cathedral
The main Gothic church in Barcelona. The cloister is maybe the most interesting part.
2,000 years of history that remounts to the days when Barcelona was a Roman enclave, uncover charming squares and hidden gems where the locals hang out these days.
This square has been the political hub since the Roman era. It has been witness to some of the most important events in modern Catalan history, such as the proclamation of the Catalan State in 1931. At one end, there is the Palace of the Generalitat (the one with two flags on the top, the government of the Autonomous Community of Catalunya) and on the other stands the City Hall (three flags). Both are Gothic buildings, although their fronts are newer (the Generalitat's is the best example of Barcelona's Renaissance art). But if you can go inside, both are very important civil Gothic buildings. The two buildings have guides.
Sinagoga Major
They open during the morning. It is the re-discovered synagogue from the Jewish quarter, called call. This building, not very spectacular, is important since it has been here since the Roman era, and stayed as a synagogue until the Jewish exodus in the 15th century. The guide explains all the facts from the place in several languages.
One of the most romantic squares in Barcelona, it hides a dark history in that it was built over the city's old cemetery. Barcelona's most famous architect, Antonio Gaudi, was on his way to visit the church there when he was run over and killed in 1928. There is a baroque church (Sant Felip Neri), a 14th-century palace and a fountain in the middle. To arrive, take the narrow street next to the cathedral cloister. The palace was moved from its original location in the street Via Laietana during the 1920s. If you look the front of the church, you can see some holes made by a civil war bomb. If you go out the square through the other street, you'll arrive to the street Baixada de Santa Eulàlia, where is said that the Barcelona's protector was tormented.