Triana is the old working class neighborhood where I stayed. Known for its ceramics workshops, and the lively nightlife down by the river just south of the Isabel II bridge. Just north of that bridge on the east side of the river is the Castillo de San Jorge, and the Mercado de Triana. Farther north is Sevilla Tower. a 40-story office building, completed in 2015.
Right across the Guadalquivir river on the Puente (bridge) San Telmo, is the central tourist and government area, including the Gold Tower, a preserved section of the old walls, the Real Alcazar, Las Setas de Sevilla,the University of Sevilla building that used to be a cigar factory, and the fabulous Plaza de España in the Maria Luisa park.
Triana
Two sections of the wall that once protected Sevilla from invasion.
These are Las Setas (or "the Mushrooms" -- which were formerly called Metropol Parasol.) Located in the Plaza de La Encarnación, which previously contained a dilapidated market building and a carpark, Las Setas is the world's largest wooden structure. Completed in 2011, it contains an archaeological museum featuring Roman ruins and a Moorish residence (both in the lowest level), a traditional market and restaurants in the middle levels, a performance space and a public plaza above, and a skywalk at the top with terrific views of Seville's old city. Its unique waffle texture can be spotted from all the streets around the Plaza. Initially disliked by many local citizens, it has become the third-most-visited location in Sevilla. (The architect likes to point out that the Eiffel Tower was initially disliked by the Parisians.) (More information here at Wikipedia and here in an architectural periodical)
Real
Alcázar
The Royal Alcazar (Arabic al qasr -- meaning fort or palace) is a palace and the official residence of the royal family when they visit Sevilla. First begun in the 10th century by the Moorish rulers, it was subsequently added to and renovated by new rulers, in particular by Pedro I in the 1360's in an ornate Moorish style. It resembles the Alhambra palace being built around the same time by the Nasrids in Granada.
