London is a very old city. One of the Wren churches has a crypt from an earlier church, so 21st Century, then into 17th century then down to something like 13th century. Another staircase down under that and you are standing in a Roman structure.

Oxford: On the main road through the centre is an old tower, the Carfax Tower, 11th century so 900 years old. You can sit in the churchyard outside that tower and have a coffee and pastry. People have been stopping for a while outside that tower for a long time. It is nice on a sunny day towards evening when the warmth of the stones staves off the chill from the rivers.

Chester: Pop into Superdrug on Northgate Street for toothpaste. Medieval chapel, wool exchange, theatre and music hall. Dickens did a reading there.

I visited Spain at the tail end of Franco. Interminable great inequality had left ruins bare, in long slumbering decay, preserved by poverty. A kid could crawl out on sketchy crumbling walls, on stones perhaps last touched many centuries before by builder's hands... or perhaps by another kid in the last few. A couple of decades later, something rather different stood there... stabilized, safe, "restored", Disney-ified, and far less compelling.

We had the "built on an Indian graveyard" trope about our local little league fields. Turns out, true story bro. Ref attached 1960 newspaper story, "From an Ancient Indian Burial Ground":

https://www.nyshistoricnewspapers.org/?a=d&d=sfcn19600623-01...

https://www.fireislandnews.com/history/long-islands-native-a...

A lot of European towns and cities are far older than their official incorporation date or founding. I can think of ones that are built on obvious defensive and trading sites that appear to date back thousands of years