Lindau Lighthouse is the southernmost lighthouse in Germany, located on Lake Constance. The lighthouse was built from 1853 to 1856 at the western mole in the entrance to the harbour of Lindau and was first lit on 4 October 1856. It succeeded the light station in the Mangturm tower of 1230.
During the first years of operation the light was created by an open oil fire. At that time the keeper would steadily have to keep the fire burning in great pans and operate a bell and foghorn. The firing was later converted to kerosene and then gas. Since 1936 the tower has been operated electrically and was automated in the early 1990s. The light is lit on demand by ships using radio signals. The light characteristic is one flash every three seconds which is created by two rotating parabolic reflectors.
The lighthouse and the entire port of Lindau were originally built by the Bavarian Railway Company and later used to be operated by the shipping department for Lake Constance of Deutsche Bahn. Eventually the port was sold to the city works of Constance in 2002 together with the Bodensee-Schiffsbetriebe GmbH shipping company. After several years of negotiations the port area and thus the lighthouse were transferred to the town of Lindau in April 2010. It is open to visitors who may find information on local fauna and flora and on Lake Constance shipping.
The lighthouse is a popular subject for photographs.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.