• Free entry slots on Tuesdays 3pm to 5pm and Sundays 6:30pm to 8pm, booked online until full (not in summer)
• Timed tickets: you can't go in before the time printed on yours, and the museum recommends buying online over the box office
• Dinosaurs upstairs, whale downstairs: the fossil hall is on the first and second floors, the Biodiversity hall on the ground floor

This is one of the oldest natural history museums in the world, split into a geology wing and a biology wing. The fossil hall holds Dippy, a Diplodocus cast that arrived in 1913, beside the Megatherium giant ground sloth and a replica of Lucy. The Biodiversity hall, signed in Spanish and English, has a 21-meter fin whale skeleton, an African elephant and extinct animals like the Tasmanian tiger.