Monument to the Discoveries

This striking 52-meter riverside monument was built to mark the 500th anniversary of Henry the Navigator's death, honoring the Portuguese explorers who changed the map of the world. You can ride up to the viewpoint for sweeping views over the Tagus River and Belém, then catch an exhibition and film inside for €10 — or just €5 if you're aged 13–25. It's one of those places that actually earns its landmark status, sitting right alongside the Jerónimos Monastery and Belém Tower in Lisbon's most monument-dense neighborhood.