How Heavy is a City? is the theme of the 2025 edition of the Lisbon Architecture Triennale, which celebrates its seventh edition.

The festival explores the future of urban environments and cohabitation through three themes – Fluxes, Spectres and Lighter – with each offering an exhibition and talks programme.

Lisbon Architecture Triennale 2025 takes place from 2 October to 8 December 2025 at various locations across Lisbon, Portugal.