Officially known as Piazza Vigliena, Quattro Canti is considered one of the most fascinating landmarks of Palermo. Located at the intersection of Via Maqueda and Corso Vittorio Emanuele, it has an octagonal structure shaped by the elegant facades of the buildings standing at its corners. During the day, the sun is always shining on at least one of the four facades: leading to this Baroque gem being nicknamed by locals "il teatro del sole" ("the theatre of the sun").

Although no tours are offered inside Al Alam Palace, the building, which serves as the ceremonial residence of Sultan Haitham bin Tariq is still a must-see on your Muscat itinerary. Perched gracefully against a backdrop of rugged hills and adjacent to the picturesque Mutrah Corniche, the palace's striking façade is a feast for the eyes. Visitors can wander around its grounds to marvel at its intricate exterior and lush gardens. Adding to the grandeur, the palace is flanked by two imposing 16th-century forts, Al Mirani and Al Jalali.

The Royal Opera House is a relatively recent (it opened in 2011), yet critical addition to the Omani cultural scene where the Sultan Qaboos bin Said Al Said himself is a regular. Sleek on the outside, the white-stone building boasts elaborate inner décor that serves as the backdrop to some of the world’s finest performances.