History

In my hometown in Spain, there's a recurring joke every time we see someone building something new that requires digging:

"What do you guess they're gonna find this time? Romans? Muslims? Jews?"

And the fun thing is that most of the time, they do find one of those three.

I live in small city in Europe and...they do dread it. Especially our old town has overprotective archeologists running amok and they are doing all they can to stop any construction trying to ignore archeological finds. Thanks to god for overprotective archeologists.

I also heard many folk from construction grumble about construction getting stopped because they found piece of medieval wall or something. xD

Well, it's usually not the contractors that are most affected, but rather the land owners.

But yeah, archeological findings or WWII bombs can shut your construction down for months, if not forever.

What's also always loved, is when your building or a neighboring building is so old that it's declared a cultural heritage site.
My grandparents' house came with a section of medieval city wall. They used it like an attic, because they weren't allowed to put heating into there or anything like that, and you basically always needed a permit for structural changes.

Bombs. Many large cities or industrial areas in Germany are peppered with unexploded ordinances. They are even underneath buildings quickly erected after the war and only found when those are being demolished. When properly handled, they luckily don't pose too much of a risk.

Major issue and concern for all parties involved.

Both stop of work and destruction of artifacts are common' occurrence.

I kind of wish schools would take you on a more thorough tour of the building once in a while, my high school was pretty huge and there were parts of it we never got to go to, doors we never saw opened, etc.

Now a lot of those were janitors closets and such, mostly nothing too exciting, but one of them in particular had a stairway that went pretty far down and the rumor was always that there was a bomb shelter down there, which is pretty likely because that part of the building was built in the cold war.

And there were a few pretty cool rooms that you'd only get to see if you were in certain clubs and such. We had a whole little public access tv station sort of thing and I never saw more of it than what I could see through the front door because I wasn't in the TV production club/class, the band orchestra, and choir had some pretty cool rooms that most of the school would never see, there was a whole courtyard that I don't think I ever saw a single person in the entire time I was there and the doors were usually locked despite the fact that it was completely closed in by the school building, so hardly a security risk, I doubt we were gonna have many people scaling the walls to rappel into the courtyard or parachuting into it

There were also rumors that under our pool was once a bowling alley.

Native american cities and villages are constantly being uncovered.