Madrid's Royal Palace is the largest of its kind in Western Europe, spanning over 135000 m sq with approximately 2800 rooms. Palacio Real is the largest building and architectural splendor in Madrid, Spain. Originating from the 18th and 19th centuries, it is the Royal Family's official residence, though not currently used as a residence but only on occasions. Situated on Bailen Street, East of Manzanares River, it is open as a tourist attraction to see the Royal glory in 50 rooms with the Hall of Columns, Throne Room, China Collection, Royal Chapel, the Imperial Ballroom, the Royal Guest Chambers, and the porcelain rooms amongst others. The Palace was the brainchild of King Felipe V and was planned and designed by the Italian architect Sabatini. The work was undertaken between 1738 -1770.With art, frescos, and paintings by Tiépolo, Velázquez, Goya, Giordano, this palace is a popular spectacle and photo opportunity. The Palace houses the 13th century Royal Armory with medieval weapons with the traditional Pharmacia of several hundred bottles of early medicine and laboratory. Also, here is the world's only complete Stradivarius string quintet in addition to the collection of tapestry, porcelain amongst others. The change of Guard at the Palace is another featured attraction that takes place only on the first Wednesdays of the month. Surrounding Palacio Real are the Campo del Moro gardens, Plaza de Oriente, and the Teatro Real opera house. There is an entrance fee charged for seeing the palace for a tour of approximately 45 minutes.