The Mauritshuis museum houses the Royal Cabinet of Paintings which consists of 841 objects, primarily Dutch Golden Age paintings. The collections contains works by Johannes Vermeer, Rembrandt van Rijn, Jan Steen, Paulus Potter, Frans Hals, Hans Holbein the Younger, and others. Probably the most famous painting in Mauritshuis is The Girl with a Pearl Earring (ca. 1665), one of Dutch painter Johannes Vermeer's masterworks. It has been in the collection of the Mauritshuis gallery in The Hague since 1902. The another masterpiece in collection is the Anatomy Lesson of Dr. Nicolaes Tulp painted by Rembrandt van Rijn (ca. 1632).
Originally, the 17th century building was the residence of count John Maurice of Nassau. In 1820, the Mauritshuis was bought by the Dutch state for the purpose of housing the Royal Cabinet of Paintings. In 1822, the Mauritshuis was opened to the public and housed the Royal Cabinet of Paintings and the Royal Cabinet of Rarities. In 1875, the entire museum became available for paintings. It is now the property of the government of the Netherlands and is listed in the top 100 Dutch heritage sites.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.