The Viscount of Monserrate, a title bestowed on Francis Cook by King D. Louis, started to work with the architect James Knowles The Palace became the summer residence of the Cook family.
As for the Park of Monserrate, it’s also open every day, but from 9 am to 7 pm. And both the last ticket and entry are at 6 pm.
Adults Ticket (18-64 years old) costs €8, while the Youths Ticket (6-17 years old) costs €6.50. There’s also a Seniors Ticket (for people over 65), at the same price as the Youths Ticket, as well as a Family Ticket (2 adults + 2 young people) for €26.
Tickets can be purchased online at Parques de Sintra to receive a 5% discount of above prices.
Info as of May 2023. Be sure to check their website for any updated hours/pricing.