Second clue:

This city played a large strategic role in the beginning of the Battle of the Bulge.

Monschau ?

Excellent! :)

OK
How about this (all 3 are the same place):


.

.

It looks like it could be in the Swiss Alps.

Could be.

That’s a Roman amphitheater where cows fight…

Roman Amphitheatre, Martigny, Switzerland

Yes, that is Martigny, Switzerland. To the east is Italy, to the south is France.
Your turn !

How about this...

Tough one, too generic. Can be anywhere, and no obvious clues in the pic. Nice, we like it difficult :slight_smile:

Somewhere in England perhaps. Not for from London maybe.

Wrong country, but right continent. ;)

Second clue:

It's a royal castle.

Looks like a building from “The Girl with the Dragon Tattoo”.

I haven't seen that movie, but it sounds like it's right up my alley. 8)

Wawel Royal Castle, Poland?

Nope.

Today, the third clue is brought to you by the letter K.

The name of this castle and the city it is in both begin with the letter K.

Koldinghus, Kolding, Denmark?