If your trip to Donje Pokuplje is all locked in but your itinerary is a little on the empty side, let us give you a helping hand.Plan a stop at Katzler Pavilion. It's one sight you'll find on most visitors' must-do lists. If you still have space on that itinerary, Holy Trinity Church and Franciscan Monastery and Dubovac Castle will keep you on the go as well.