The fortress of Cetin is situated 5 kilometres south of Cetingrad above the village of Podcetin. The date when Cetin was founded is unknown. There are some indications that a settlement existed there in the times of the Roman Empire. The Parish of All Saints, in which the fortress is situated, was first mentioned in 1334. In 1387, king Sigismund, Holy Roman Emperor gifted Cetin to Ivan Krčki. Thereby it became the property of the Frankopan family.
The Middle Ages were the golden era of Cetin. There was a Franciscan monastery and several churches near the fortress. In the 15th century, the Cetinski branch of Frankopan family was formed. It only lasted a hundred years. Ivan Frankopan Cetinski died in the Battle of Krbava field. His brother Grgur and son Franjo Frankopan became archbishops of Kalocsa. Franjo Frankopan was the last member of the Frankopan Cetinski family. After him, the fortress became property of the Frankopan Slunjski family.
Cetin played an important role in the history of Croatia. After the defeat at the Battle of Mohács in 1526, Croatian nobility gathered at the Parliament on Cetin (Cetinski sabor). On 1 January 1527, they elected Ferdinand Habsburg, Archduke of Austria as the king of Croatia. The chart signed by Croatian nobles and representatives of Ferdinand of Habsburg is among the most important documents of Croatian statehood and is preserved in the Austrian State Archives in Vienna.
In the following centuries, Cetin was part of the Military Frontier, the borderland between the Habsburg Monarchy and the Ottoman Empire. During this period, Ottoman army took control of it several times. The fortress was often damaged and repaired. Two stone plates with Arabic inscriptions in the Croatian History Museum testify about reconstructions made during this period. In 1790, Austrian troops under the command of general Walisch finally won back Cetin for the Habsburg monarchy. The siege took one month, and after the battle several officers were decorated, including Johann I Josef, Prince of Liechtenstein. Cetin's status was finally confirmed during the peace conference in Svishtov. In 1809, Ottoman forces once again occupied Cetin but they withdrew the following year under the threats of Marshal Marmont, governor-general of Illyrian provinces. Once the Ottoman threat petered out the fortress was abandoned and turned into a quarry. Administrative control of the surrounding area was transferred to the village of Cetingrad, which developed north of Cetin.
The Seaplane Harbour is the newest and one of the most exciting museums in Tallinn. It tells stories about the Estonian maritime and military history. The museum’s display, that comprises of more than a couple of hundred large exhibits, revitalizes the colourful history of Estonia.
British built submarine Lembit weighing 600 tones is the centrepiece of the new museum. Built in 1936 for the Estonian navy, Lembit served in the World War II under the Soviet flag. It remained in service for 75 years being the oldest submarine in the World still in use until it was hauled ashore in 2011. Despite its long history, Lembit is still in an excellent condition offering a glimpse of the 1930s art of technology.
Another exciting attraction is a full-scale replica of Short Type 184, a British pre-World War II seaplane, which was also used by the Estonian armed forces. Short Type 184 has earned its place in military history by being the first aircraft ever to attack an enemy’s ship with an air-launched torpedo. Since none of the original seaplanes have survived, the replica in Seaplane Harbour is the only full-size representation of the aircraft in the whole World.
Simulators mimicking a flight above Tallinn, around-the-world journey in the yellow submarine, navigating on the Tallinn bay make this museum heaven for kids or adventurous adults.
Seaplane Harbour operates in architecturally unique hangars built almost a century ago, in 1916 and 1917, as a part of Peter the Great sea fortress. These hangars are the World’s first reinforced concrete shell structures of such a great size. Charles Lindbergh, the man who performed the first solo flight across the Atlantic Ocean, landed here in 1930s.
On the outdoor area visitors can tour a collection of historic ships, including the Suur Tõll, Europe's largest steam-powered icebreaker.