Palacio Real de Madrid.

The Palacio Real de Madrid (Royal Palace of Madrid), also known as the Palacio de Oriente (The East Palace), is the official residence of the King of Spain in the city of Madrid and is only used for State Ceremonies.

However, King Juan Carlos and the Royal Family do not reside in in it, choosing instead the more modest Palacio de la Zarzuela on the outskirts of Madrid. The palace is owned by the Spanish State and administered by the Patrimonio Nacional, a public agency of the Ministry of the Presidency.

The palace is located on Bailén Street, in the Western part of downtown Madrid, East of the Manzanares River, and is accessible from the Ópera metro station. The palace is partially open to public, except when it is being used for official business. – wikipedia

       

Almudena Cathedral.

Santa María la Real de La Almudena is a Catholic cathedral in Madrid. The Neo-Gothic interior is uniquely modern, with chapels and statues of contemporary artists, in heretogeneous styles, from historical revivals to "pop-art" decor. The Neo-Romanesque crypt houses a 16th century image of the Virgen de la Almudena. Nearby along the Calle Mayor excavations have unearthed remains of Moorish and medieval city walls. – Wikipedia

                 

Puerta del Sol.

"The Puerta del Sol (Spanish for "Gate of the Sun") is one of the most well known and busiest places in Madrid. This is the centre of the radial network of Spanish roads. The square also contains the famous clock whose bells mark the traditional eating of the Twelve Grapes and the beginning of a new year." – Wikipedia

Palacio de Comunicaciones (Office of the Mayor).

"Madrid is the capital and largest city of Spain. It is the third-most populous municipality in the European Union after Greater London and Berlin, and its metropolitan area is the fourth-most populous urban area in the European Union after Paris, London, and the Ruhr Area." – Wikipedia

El Retiro park.

"The Jardines del Buen Retiro or Parque del Buen Retiro (literally "Gardens" or "Park of the Pleasant Retreat"), or simply El Retiro, the "Lungs of Madrid", is the main park of the city of Madrid, capital of Spain." – Wikipedia

       

The Museo del Prado.

"The Museo del Prado is a museum and art gallery located in Madrid, the capital of Spain. It features one of the world's finest collections of European art, from the 12th century to the early 19th century, based on the former Spanish Royal Collection. Founded as a museum of paintings and sculpture, it also contains important collections of more than 5,000 drawings, 2,000 prints, 1,000 coins and medals, and almost 2,000 decorative objects and works of art. Sculpture is represented by more than 700 works and by a smaller number of sculptural fragments. It is one of the most visited sites in Madrid." – Wikipedia