3 Best Sights in Ibiza and the Balearic Islands, Spain

Overlooking the city and the bay from a hillside, the castle was built at the beginning of the 14th century in Gothic style but with a circular design—the only one of its kind in Spain. It houses an archaeological museum of the history of Mallorca and a small collection of classical sculpture. The Bus Turistic 50 and the EMT municipal buses Nos. 4, 20, and 46 all stop a 20-minute walk from the entrance. In summer, there are classical music concerts in the courtyard, performed by the Ciutat de Palma Symphony Orchestra.

Opposite Palma's cathedral, this palace was originally an Arab citadel, then became the residence of the ruling house during the Middle Ages. It's now a military headquarters and the king's official residence when he's in Mallorca. Audio guides cost €4.

Try to catch the changing of the Honor Guard ceremony, which takes place in front of the palace at noon on the last Saturday of the month (7.30 pm in July and August).

The block-long 19th-century Palau Torresaura was built by the Baron of Torresaura, one of the noble families from Aragón and Catalonia that moved to Menorca after it was captured from the Moors in the 13th century. The interesting facade faces the plaza, though the entrance is on the side street. It is not open to the public.