Early modern period
As a result of major fires in 1568, 1637, 1671, 1673 and 1699 and the Thirty Years' War the town was frequently devastated.
The first town hall stood on the Alter Markt and then in the middle on the Neuer Markt. The present town hall on Neuer Markt was built from 1791 to 1797 and extended in 1857.
In 1806 there was fighting in the town and surrounding area between Blücher and the French.
The canalisation of the River Elde (1798–1803 and 1831–1837) and the construction of the Bolter Canal (1831–1837) resulted in an economic boom in the town. In 1839 a vocational school was founded. In 1845 the first public baths opened on the Müritz. In 1862 the Birkenstädt Brewery was founded in present-day Müritzstraße by the town harbour; the brewery closed again in 1920. In 1869 the grammar school (Gymnasium) opened, initially as a progymnasium, (today it is the Richard Wossidlo Grammar School). In 1848–49 the country road (Chaussee) from Malchow via Waren to Neubrandenburg was built and, with its connexion to the Waren–Malchin railway in 1879, Waren developed into a transport hub. In 1885 the Mecklenburg Southern Railway from Parchim via Waren to Neubrandenburg was opened and, in 1886, the Lloyd Railway from Neustrelitz via Waren to Rostock followed suit.
In 1920 the cavalry captain, Rittmeister Stephan von le Fort (1884–1953) from Gut Boek, gathered a group of Freikorps fighters around him and imposed a state of siege on the town of Waren during the Kapp Putsch on 17 March 1920. On 18 March, he and his cousin, Reichswehr lieutenant Peter Alexander von le Fort, gave orders for a cannon and three machine guns to open fire on the town from Gallows Hill (Galgenberg), resulting in five deaths and eleven seriously wounded. After the putsch was suppressed, both men fled to Munich and Austria and the family seat was seized by the Free State of Mecklenburg-Strelitz. At the back of Waren Town Hall, a bullet hole can still be seen today as reminder of the affair.
In 1920 the town began raising a spa tax. On 3 December 1920 Waren became the county town of the county of Waren. On 11 November 1925 the sub-district (Amt) of Röbel was incorporated into the Amt of Waren. In 1925 the first electric lights were lit. In the same year Waren Harbour reached its economic peak – 188 ships arrived and 208 departed handling a total of 22,330 tonnes of goods.
In 1927 the following big firms were operating in the town: the Naschkatze dairy, the Piechatzek engineering works and iron foundry (today Mecklenburger Metallguss), the Steinborn steam-powered sawmill and the Thiele und Buggisch mill. There was also a milk exporting concern, Natura, a potato factory, the Strubelt steam-powered sawmill, a gas works and a fish-processing plant.
There were 14 construction businesses, a roofing felt company, five mills, two cement factories and the Rosengarten Fishery.
The Roman Catholic Church was consecrated on 15 September 1929.
At the district elections on 1 November 1931, the Nazis were the largest party. They filled the post of district chief executive (Amtshauptmann) on 1 April 1932 and mayor in December 1932. During the Nazi era, Jewish townsfolk were persecuted, expelled and murdered in concentration camps. The Jewish community, which had numbered 150 in the middle of the 19th century, had dwindled by April 1938 to nine. The old synagogue was sold in 1936 to a private owner, so that it was not destroyed by the Nazis. However, the Jewish cemetery was desecrated and destroyed in the November Pogrom of 1938. Since 1961 a memorial has commemorated it. In 1942 there were no Jews left in Waren.
From 1936 the Dürener Metallwerke (suppliers to the military aircraft industry) established a plant in Waren, the Mecklenburgische Metallwarenfabrik Waren or Memefa, which belonged to the Quandt Group. Several thousand POWs, as well as men and women from the countries occupied by Germany, were used as forced labourers there, working sometimes in inhumane conditions.
To provide works housing for the German workforce, from 1936 to 1941, a new residential area, the Westsiedlung, was built. For this the Berlin architect, Günther Paul (1898–1976), designed multi-family houses (in Thomas-Mann-Straße, Friedrich-Engels-Platz and Clara Zetkin-Straße), semi-detached houses and the so-called foremen's homes. As a result, the population grew by more than 4,000. In Warenshof, a naval base (Marinenlager) was established as hutted camp for training the intelligence service of the Navy.
During the Second World War a naval hospital was set up in the Müritzhöhe spa centre. In addition, during the final months of the war, the primary school (Volksschule) on Denkmalstraße, the grammar school and the Warener Hof hotel became emergency wards. On 1 May 1945 the Red Army occupied the town without a fight.
In October, Friedrich Dethloff (KPD) became the new mayor, by order of the Soviet military commander. The Soviet NKVD centre at Kietzstraße 10, the "House of Horrors", was known for its tough interrogation and torture. By the end of the year, over 6,000 refugees from the eastern territories had entered the town. By the spring of 1946, there was a typhus epidemic that claimed many victims. The facilities of the "Memefa" and the steam mill and Thiele Buggisch were dismantled as war reparations and sent to the Soviet Union. The Rostock to Neustrelitz railway and the sections of line from Malchow to Karow and Möllenhagen to Neubrandenburg were closed and the track removed.
In the 1970s, large parts of the historic old town were demolished; sacrificed for a large-scale new traffic system. This devastation resulted in a raising of awareness in Waren among many of the residents, especially for the preservation of the remaining, often centuries-old buildings of the Old Town. A citizen's movement "Save the Old Town" was established long before the Berlin Wall fell and the border re-opened and their work has contributed greatly to the charm of the town centre today.
During the Cold War, Waren was home to one of the four central nuclear missile depots of the Group of Soviet Forces in Germany.
In 1991, after German reunification, the historic town centre between Lake Müritz and the Tiefwarensee lake was renovated as part of an urban development programme. The town with its two churches, town hall, old and new markets and the stores has been improved. Since 1 May 1999 the town has been able to call itself a "state-approved health resort", but its target is to become a recognised saltwater health spa.
