"I think it must have been, Anna. And the other lady was her sister Louise. You know that Princess Ingrid, the wife of our Crown Prince, is a Swedish princess by birth. Today's newspaper says that Princess Louise has come from Sweden to visit her sister Ingrid. Here is their picture. Does it look like the two whom you saw?" Both girls looked at the paper eagerly. "Yes, it _was_ Princess Ingrid and Princess Louise," said Greta. "Oh, I must write Hans about this. He has never even _seen_ a Princess. And now I have seen two of them and even talked to one." CHAPTER XI THE BEST SURPRISE OF ALL "Now it's our turn to show _you_ some castles, Greta," said Anna, as she and her mother and Greta got in the car. Anna's mother had promised to take the girls on an all-day trip to northern Zealand. This part of Denmark is as full of castles as a plum-cake is full of plums. After driving about twenty-five miles along the shore, they came to Kronborg Castle, in the town of Elsinore. "This is the most famous castle in Denmark," said Anna's mother. "Why?" asked Greta. "Haven't you ever read 'Hamlet,' Greta?" asked Anna in surprise. "Kronborg Castle is where Hamlet lived. Only Shakespeare called it Elsinore, which is the name of the town instead of the castle." [Illustration: KRONBORG CASTLE] As she walked across the old drawbridge and entered the outer yard of the castle, Greta thought that Kronborg was the loveliest castle she had ever seen. It was much larger and much more wonderful than Vosborg. When they came to the drawbridge across the second moat, Anna pointed out the high battlement where the ghost of the murdered king once walked. "Does he still walk there, Anna?" asked Greta. "Maybe he does, Greta. All we really know about him is what Shakespeare tells us in his play." When they crossed the last bridge and passed through the last gateway into the inner courtyard of Kronborg, Greta stopped in surprise. "Oh, Anna, it's so large and so beautiful." Then, just to show that she wasn't really afraid of climbing, she asked, "Tante Elsie, do you suppose we could climb to the top of one of the towers?" "Yes, I think so." From the little balcony on the tower they looked out over the ocean. "Is that an island across the water?" asked Greta. "Oh, no, Greta. That is Sweden, only three miles away. In the olden days, Kronborg was a fortress that guarded the entrance to the Baltic Sea. All the ships that came from the North Sea into the Kattegat and then into the Baltic had to pass this point of land, and every ship that went by here had to pay money to Denmark. Up here in this very tower there were guards who watched all the ships to see that every one stopped and paid for the privilege of going past this point. In those days, Kronborg was the most important castle in Denmark." [Illustration: THE MOAT AROUND KRONBORG] "Don't they have to pay this money now?"