After passing under the round City Tower, the former main medieval town entrance that gave access to the coast, you'll enter the centre of Rijeka's Old Town. Located in the modern-day Ivan Kobler Square, there was once a more compact municipal centre called Placa, which served the significantly smaller fortified medieval town.

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.

The Western Wall is the only part remaining of Solomon's Temple, built in the 10th century BC and destroyed twice. Praying here carries a lot of meaning for Jewish believers, who mumble hymns and insert prayers written on small pieces of paper between the bricks — every visitor is allowed to partake. The Temple was said to contain the Ark of the Covenant, a biblical golden chest. Moreover, Jesus reportedly visited the Temple as a child and left an impression on the wise men inside with his knowledge of the Bible. There are separate entrances for men and women leading to different parts of the wall. Friday evenings are particularly crowded, as Jewish people celebrate the arrival of Shabbat, the day of rest. Bar Mitzvah ceremonies take place in the morning on Monday, Thursday and Saturday: it's a great time to visit, as the place comes alive with Jewish song and dance.