San Juan y Todos los Santos (St John and All Saints) stands on the site of the former Convento de la Trinidad established shortly after Fernando III conquered the city in 1236. Built in the Baroque style, it forms part of the Historic centre of Córdoba.
It is believed the original church and convent were built on the site of a mosque although nothing remains of it. Nor are there any remains of the Church of San Juan de los Caballeros which remained after the convent was disbanded. There are however records of the roof collapsing in the 16th century and of its subsequent repair funded by Don Martin de Córdoba.
After the building again fell into disrepair, it was decided to build a completely new church which was consecrated on Trinity Sunday in 1705. The Baroque building is constructed in the form of a Latin cross with a nave covered by a barrel-vaulted ceiling decorated with painted lunettes. The dome above the transept is supported by pendentives. The church's artwork includes a figure of Christ the Saviour (Santo Cristo de la Salud) from 1590 carved by an anonymous author. It was brought from the former convent church of the Order of the Trinity (Orden Trinitaria) which used to be located in the Vía Crucis. Recent paintings from the nearby Cofrafía de la Santa Faz monastery include Nuestro Padre Jesús Nazerano by Antonio Dubé de Luque and María Santísima de la Trinidad by Antonio Salto.
The decorations surrounding the church's entrance contrast with its whitewashed facade topped with a triangular pediment and two oculi. The portal consists of a Romanesque arch flanked by double Doric columns with a frieze of triglyphs and metopes. The upper section with Solomonic columns contains group of sculptures in a niche with an angel in a Trinity robe assisting two captives. The square-shaped sacristy is decorated with several notable murals by Antonio Palomino (1653–1726). They depict scenes from the Old Testament associated with the Eucharist. The church's altarpieces are also decorated with a number of works from the 17th and 18th centuries.
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Carlsten is a stone fortress built on the orders of King Carl X of Sweden following the Treaty of Roskilde, 1658 to protect the newly acquired province of Bohuslän from hostile attacks. The site of Marstrand was chosen because of its location and its access to an ice free port. Initially a square stone tower was constructed, but by 1680 it was reconstructed and replaced by a round shaped tower. Successive additions to the fortress were carried out, by the inmates sentenced to hard labour, until 1860 when it was reported finished. The fortress was decommissioned as a permanent defense installation in 1882, but remained in military use until the early 1990s.
The fortress was attacked and sieged twice falling into enemy hands. In 1677 it was conquered by Ulrik Frederick Gyldenløve, the Danish military commander in Norway and in 1719 by the Norwegian Vice-Admiral Tordenskjold. At both occasions the fortress was returned to Swedish control through negotiations and treaties.