Museu de Marinha

Planetarium where every show lists the age it suits, so you can pick one your kid will sit through.

Rooftop pool, plus a spa and indoor pools with set hours for under-16s.

The original Belém custard tart bakery, with takeaway and seated service.

A simple Belém base with studios that sleep four, with a fridge and microwave.

Museum of art, architecture and technology on the river, where kids up to 12 get in free.