Located on a hill on the outskirts of Gracia, Park Guell is a UNESCO-listed public park designed by Gaudi in the 1900s (including a museum dedicated to the architect, Gaudi House Museum). This enchanting place is well-known for its colorful mosaics, whimsical decorations, and ornamental paths. The park is largely free for public access except a small restricted section called the Monumental Zone. Most of Gaudi’s work is located in this zone so it’s definitely the most popular part of the park. The entry to the zone is limited to a maximum of 400 people every half an hour. It is highly recommended to book tickets for your desired entry time in advance.