• Free on Tuesday mornings for everyone from 10am to 1:30pm, and always free for under-18s
• Enter only by the Puerta de Murillo, opposite the Prado; the Claudio Moyano gate is for staff
• Paths only: no bikes, scooters, balls or picnics, and under-14s must stay with an adult

A walled garden beside the Prado holding more than 5,500 plant species from around the world, on terraces that step up the slope. Kids find about 1,500 trees, some of them centuries old, a terrace of bonsai and greenhouses to walk through. It is a living museum, not a park: paths only, no bikes, scooters, balls or picnics, so it suits curious kids more than runners.