If learning about the presidents/ presidency of a country is your jam, this is for you all hour or so long- if you're really good at spreading your time out. The most interesting part to me was a video on the second floor going over the various presidents from 1910. All the portraits are there, a number of gifts from other states people and countries, and regalia (they are really into the regalia here). There's a pic of Charles & Di among the foreign luminaries who sent the Portuguese president of the time a signed photo (in a Xmas card, perhaps?) Doesn't take long to see it and if you want to see the documentation archives center (ATTENTION: architects), you have to write ahead of time to request permission. read more