At 9:40 on the morning of 1 November 1755 — All Saints' Day, when most of Lisbon's population was inside a church — an earthquake estimated between 8.5 and 9 on the Richter scale struck the city. Three separate tremors, a tsunami, and fires that burned for five days killed between 30,000 and 40,000 people and levelled roughly 85% of the built environment. The Marquis of Pombal rebuilt the lower city from scratch on a rational Enlightenment grid — one of the first planned urban rebuilds in European history. But one neighbourhood didn't fall. Alfama, the ancient Moorish quarter, sat on solid schist bedrock and held. The street pattern you walk today is the one laid down before the 12th century. That single geological accident is the reason Lisbon feels unlike any other Western European capital: its oldest layers weren't buried under 19th-century renovation. They stayed visible, walkable, and inhabited. A long weekend in Lisbon — three full days, properly structured — is enough time to feel that depth across millennia of empire, faith, and fado. But only if you spend those days the right way.