Today Orphir contains the remains of Scotland's only surviving circular medieval church. Built in the late 11th, or early 12th century, the Orphir Round Church is thought to have been built by Earl Hakon. Dedicated to Saint Nicholas, its design was inspired by the Church of the Holy Sepulcher in Jerusalem.
At the time of the church construction, the Great Crusades were in full swing and the circular church had become a popular design with returning crusaders attempting to copy the famous structure in the Holy Land.
Originally, the church consisted of a circular nave just over six metres in diameter and an apse. The apse remains today, along with a small section of the nave's eastern section.
The church survived, almost complete, until the middle of the 18th century when sections were pulled down and the stone used to construct the new parish church. The replacement parish church did not last and no trace survives today.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.