There are many attractions near Sant Sebastia. Aquarium Barcelona has a wide collection of marine life from around the world, with over 11,000 animals representing 450 different species. It is home to the Oceanarium, a massive tank that holds 4 million liters of water and features an 80-meter-long underwater tunnel where visitors can walk through and observe sharks, rays, and other large marine species swimming overhead. In addition, the aquarium regularly hosts many interesting educational programs, special events, temporary exhibitions, and themed activities for visitors of all ages throughout the year. Montjuic Castle is a 17th-century military fortress perched atop Montjuic Hill that plays a pivotal role in the city's history, as it served as a key defensive point for the region, witnessing numerous sieges and battles. Over the years, the castle has been used as a political prison and a military museum. Visitors can explore its historic walls and enjoy interesting exhibits that showcase its historical significance with panoramic city views. It also hosts many cultural events, exhibitions, and outdoor concerts that attract a large influx of tourists throughout the year.

La Sagrada Familia is one of the largest but unfinished Catholic church in the world, designed by the renowned Catalan architect Antoni Gaudi. Its construction began in 1882 and continues to this day, making it one of the longest-running architectural projects in the world. This basilica is a fusion of Gothic and Art Nouveau styles, characterized by its intricate facades, soaring towers, and organic motifs inspired by nature, which is a remarkable representation of the architectural marvels of the modernist era and the city's unique history. Barcelona Zoo is spread over 13 hectares and is home to over 4000 animals from 350 different species, including lions, tigers, chimpanzees,orangutans, elephants, giraffes, and various species of birds, reptiles, and amphibians. It offers interesting educational programs, guided tours, animal encounters, interactive animal feeding, and petting sessions. If you are looking for another nearby attraction, Placa de Catalunya is a bustling plaza with a large open space, tree-lined walkways, fountains, and sculptures, including the monumental statue dedicated to Francesc Macia, former President of Catalonia. It is home to upscale retail stores, theaters, restaurants, cafes, and hotels. In addition, it also hosts many cultural events, concerts, holiday markets, and festivals throughout the year.