The Pantheon is a building in ancient Rome located in the historic center, built as a temple dedicated to all deities. It was founded in 27 BC by Marco Vipsanio Agrippa, son-in-law of Augustus. It was rebuilt by the emperor Hadrian after the fires had damaged the previous Augustan building.
It is composed of a circular structure joined to a portico in Corinthian style columns which support a pediment. The large circular cell is surrounded by thick masonry walls and by eight large pylons on which the weight of the characteristic dome is distributed where there is an opening called an oculus, which allows illumination of the internal environment.
At the beginning of the seventh century the Pantheon was converted into a Christian basilica called Santa Maria della Rotonda or Santa Maria ad Martyres. The inhabitants of Rome popularly called it "Rotonda" from which the name of the square and the nearby street also derive.
Park Güell is a large garden with architectural elements located in the upper part of Barcelona. It was designed by the architect Antoni Gaudí, built between 1900 and 1914. It is one of the largest architectural works in southern Europe. In 1984 UNESCO declared the Park Güell a World Heritage Site.