What Budapest has to offer. Part 2

One morning we decided to go to the Hungarian National museum. But it turned out to be closed that day. Which was weird because I’ve checked opening hours in the internet, and it was supposed to be open. We didn’t have any specific plans, so we stared thinking what else we could do today. And then I remembered reading reviews about the historical Metro Line 1 (yellow M1, also known as Millennium Underground), the oldest metro line in Budapest, and the second oldest in the world (opened in 1896).