How can a large art museum in a popular European capital be considered a hidden gem? To be sure, Lisbon’s National Museum of Ancient Art doesn’t have the name recognition or media exposure of the city’s other major art institutions. Nevertheless, it offers museumgoers the unique opportunity to immerse themselves in Portuguese culture and its connection to the wider world. The museum’s attractions begin with its façade, painted gold and complete with a stately baroque entryway. Once inside, visitors are encouraged to begin on the top floor where paintings and…