What is closed on Mondays?Ask › Category: Lagos › What is closed on Mondays? 0 Vote Up Vote Down Antonio Evans Staff asked 7 years ago we have booked a three night stay in Lisbon in October. our first full day is a Monday and we are now worried as we are told a number of sights etc close on Monday. This seems a little odd though. can anyone verify this. thanks. Please login or Register to submit your answer Username or Email Address Password Remember Me