Alhambra is a building that is a mix of a fortress and a palace, which was owned by the Moorish monarchs. It was made in the 14th century.
The Sagrada Familia is a beautiful Roman Catholic church in Barcelona. It started being built in the 1800s and is still not finished being built.
Ibiza is an island part of the Balearic Islands, that many people visit. It is known for having tons of parties. Ibiza also has many beautiful beaches.
Lastly, the Aqueduct of Segovia is a gorgeous monument that was built by the Romans and is still preserved to this day. It was built long ago (it is said to be built in 50 AD) and it provided water for parts of Spain for thousands of years.