One of, if not the most important centres for justice and peace in the world, Peace Palace comprises the United Nations International Court of Justice, the Permanent Court of Arbitration, the Hague Academy of International Law and the Peace Palace Library. Although this is a working palace, which means most areas are closed to the public, there is, however, a visitors centre where those interested can learn more about the history of the palace and the role it plays today in international justice via a free audio tour. On rare occasions, the palace opens its doors to the public for guided tours, but it is advisable to check well in advance if any dates are available as they are few and far between. In any case, the impressive surrounding gardens and Neo-Renaissance buildings are definitely a must-see.

This extravagantly decorated clandestine church built centuries ago when Catholicism was considered a crime is hidden in plain sight behind an unassuming front door in the city centre. Those walking down Juffrouw Idastraat would never imagine that within one of the typical terraced houses lies the enormous Parish of Saints James and Augustine where Catholics used to practice their faith in secret. Nobody is quite sure who built the church, but the stunning baroque plastering seems to suggest that it was the famous architect and artist Daniel Marot or one of his students. Book a free tour which takes you through the church and the attic to the more recent Bishop’s Chamber which is full of some of the original features and furniture that were used in the 1700s.

The gorgeous and elegant Museum of Cycladic Art contains more than 3,000 artefacts of Cycladic, Ancient Greek and Cypriot art pieces on display over four floors. This is an interesting museum to visit to get a greater understanding of this colourful culture.

Olbia’s top sight is this medieval Pisan-Romanesque church, hewn out of Galluran granite. In the apse there are two 13th-century frescoes, the left-hand one depicting San Simplicio, the patron saint of Olbia. The Festa di San Simplicio, Olbia’s biggest festival, is celebrated for three days in mid-May.