day of the underground

Yesterday I went on a city walking tour. it was again very very cold. why do I always do things outside when it is freezing? I haven’t got a clue.
Every November Rotterdam has the month of the Underground, it sounds a lot more exiting then it is unfortunately. It is a bunch of archeologist and geologist that work for city council talking about all the pipes wires, sewage pipes, and all that amazing stuff going back to the middle ages.
But I like things like that. The fact that a place first was a river, then it had a dam in it, then it was filled in and turned into a in the air railway and now it is the market. Fascinating. I am still learning things about my own town that I lived in my whole life.
The brick thing is what is left of a 13 century wall called the blue tower. It was the edge of the town at the time. It is now in the center.
After the walk I went into the wheel, a miniature version of the London eye. And only temporary. It was fun after all that time spend talking and listening about things underground to go up in the air and see the town that way.
The church is the Laurenskerk. The oldest church in town, build between 1449 to 1525 or so. And after that it was made bigger and the tower higher. One of the few buildings in the center of town that survived the German bombing at the start of the second world war.