Volume XXX of The Italian Yearbook of International Law opens with a contribution tracing the history of the Yearbook, on the occasion of the publication of its Thirtieth Anniversary Volume. It then hosts a Symposium on cities and international law. The Symposium addresses: i) the legal status of cities under international law; ii) cities and cultural heritage law; iii) cities and sustainable development; iv) cities and climate change; v) cities and the human right to adequate housing; vi) cities and international investment law; vii) an international law perspective on cities and countryside. There follows a Focus section on the Enrica Lexie (Italy v. India) arbitral award, with contributions zooming in on i) law of the sea issues arising from the award; ii) the exercise of jurisdiction on incidental questions by the Arbitral Tribunal; iii) the functional immunity of the Italian marines. The Volume further contains articles on the election of judges and prosecutors of the International Criminal Court; the case law of the European Court of Human Rights on the measures of confiscation related to the commission of serious crimes; the maritime delimitation agreement between Italy and Greece. As in every volume the following sections feature Practice of International Courts and Tribunals and Italian Practice Relating to International Law. The remaining part of the Volume contains a bibliographical index of Italian contributions to international law scholarship published in 2020, a book review section, and an analytical index for easy consultation and reference to materials cited in the Yearbook. Published with the contributions of ENI and Tenaris.