The Alcázar of Segovia, located in the central Castile and Leon region of Spain, was originally an Arab fort and became a royal palace for the monarchs of the Kingdom of Castile in the Middle Ages. Queen Isabella I of Castile and King Ferdinand II of Aragon married there. When the royal court moved to Madrid, the Alcázar of Segovia was transformed into a state prison. It later housed the Royal Artillery School in the 18th century and became a military college in 1896. Today, it is one of the major tourist attractions in Segovia.

The well-preserved Roman aqueduct bridge is the symbol of the Spanish city of Segovia and a UNESCO world heritage site since 1985. Researchers believe that it was built during the 1st and the 2nd century AD, during the reign of the Roman Emperor Vespasian or Nerva. It carried water over 18 km from the river Frío in the Sierra de Guadarrama to the center of Segovia.

The Casa de las Conchas (House of the shells) is a 15th century construction built by a knight of the Order of Santiago de Compostela. The facade is decorated with more than 300 shells representing the Order of Santiago and the pilgrimage on the Way of St. James (camino de Santiago). Today, the building houses a public library.

Palacio de Cristal (Crystal Palace), located in Retiro park in Madrid, Spain