Spots for dueling

I'm interested in places that would be fun to duel in. If you can come up with a few I'd be happy to hear them.
Requirements:
Requirements:
- Not in the way of others (some place secluded where random people wouldn't come to spoil the fun)
- At least 2 objects with Line of Sight in the vicinity
- Somewhat balanced (not too easy to kite people for ranged and not too small to avoid melee)