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The Cathedral of Altamura was built by Emperor Frederick II (1220-1250) in 1232 and became one of the most venerated sanctuaries in Puglia. In 1248, under pressure from Emperor Frederick, Pope Innocent IV declared Altamura exempt from the jurisdiction of the Bishop of Bari, making it a Palatine Church, one of the four in Puglia. The current orientation of the church is the opposite of the original, although it is not known whether the change dates back to the reign of Robert of Anjou (early 14th century) or to the enlargement carried out in 1521-1547. From the 18th century onwards, the upper parts of the two bell towers and the small gallery separating them were added. Since 1986, the church has been the seat of the Bishop of Altamura-Gravina-Acquaviva delle Fonti.

The 13th century Romanesque basilica went through numerous transformations throughout its history: the original apse was replaced by the current Gothic polygonal chancel, the southern aisle received a Baroque vault, the central nave was covered with a late Gothic lierne vault in the 15th century. In the 19th century the bell tower with parapet walk was replaced by the current new Gothic one, built in the same time as the sacristy. The oval curtain wall was reinforced with an outer bailey and four defence towers located in the four cardinal points. The northern tower collapsed at the beginning of the 20th century and parts of the ring wall and storage rooms were demolished.

The Alte Nikolaikirche is a Protestant church. The current late Gothic building was built in the 15th century.

Altenberg Cathedral was founded in the 13th century as an abbey church by the Cistercians. The church, including its interior, is strictly Gothic in style. During secularization (1803) the abbey was dissolved, and parts of the abbey later became a chemical factory. An explosion largely destroyed the abbey buildings in 1815. After the ruins of the church were donated to the Prussian state, Frederick William III (1797 -1840) gave substantial support for the restoration of the abbey church on condition that it be used as a common church. The first Protestant service took place on 13 August 1857. Further phases of restoration took place from 1894 to 1912 and in the 1960s.

Altfriedland Abbey is a former Cistercian abbey founded in the 13th century. Apart from the ruins of the refectory and the remains of a cloister, the nave is the only remaining building of the monastery, which was secularised in the 1540s as part of the Reformation.

Altun-Alem Mosque is a 16th-century Muslim temple in Novi Pazar. It is one of the oldest Islamic buildings in Serbia. Its name means "Golden Gem". It has a square shape with an entrance porch topped with two small domes.

Built and expanded in the 13th and 15th centuries respectively, the church was blazed for at least three time in its history. The altarpiece from 1862 was painted by the artist Johan Zacharias Blackstadius.

Alva Church is one of the 92 medieval churches on the island of Gotland.

Alvastra Monastery is a former Cistercian monastery founded in 1143 by monks from the French monastery of Clairvaux. Together with the monastery of Nydala, it is considered one of the first Cistercian monasteries in the Nordic countries. The monastery was used continuously until the 1530s when monasteries were banned by the Reformation.

The church in Alvdal was built according to the plans of Christian H. Grosch in 1861. The church was clad with exterior panels and painted white in 1867. The church consists of volumes of different widths in typical Grosch forms. The interior is relatively well preserved from the time of construction, but the colours come from the restoration of 1958-60.