From the platform on the top of the tower, the girls could look out over the city and the harbor. Wherever they looked, they saw towers and spires--on the Parliament Building, on the Stock Exchange, on the castles, on the churches. Some of them were gilded and they gleamed brightly in the sunshine. Some of them were shiny green, like the dome of the Marble Church. "What is that building whose tower has a crown at the top?" asked Greta. "That is Christiansborg Castle, where the Parliament meets," explained Anna. "Would you like to visit it?" "Yes. Let's go there next, if it isn't too far away," said Greta. As they walked to Christiansborg, Anna told Greta a funny story about the Round Tower. "Once upon a time a Norwegian was visiting Copenhagen. The people he visited were eager to show him all the wonderful and beautiful things in the city. The Norwegians are very proud of their own country, you know, and they like to boast about it. When they came to the Round Tower, the Danish people said, 'I'm sure you haven't anything like the Round Tower in Norway.' The Norwegian looked at it a minute and then answered, 'No, but if we had, it would be bigger and rounder.'" Greta laughed. "But it _couldn't_ be rounder, could it, Anna?" "No, of course not. If a thing is round, it's round; you can't make it more or less round." When they came to the entrance of Christiansborg, the guard told them that dogs were not allowed inside the castle. "What will we do with him, Greta?" asked Anna. "He will have to wait here at the door for us," said Greta. Turning to the dog she spoke to him very sternly, "Chouse, you must be a good dog and stay right here until Anna and I come out." Chouse barked twice, as if to say, "All right," and then he lay down on the floor beside the guard. "There has been a castle on this spot for eight hundred years," said Anna, as they walked through the long hall. "But this castle looks quite new." "Oh, there have been three or four castles here. When one burned down, they built another one. This one is about forty years old. It was really built as a home for the King, but he has never lived here. He likes Amalienborg better." "I think I would, too," said Greta. "These rooms are so large and the ceilings are so high that it wouldn't seem like a home at all." [Illustration: CHRISTIANSBORG CASTLE] In one part of the castle there were two large halls, where the Parliament meets. One hall was for the House of Commons and the other was for the Upper House. Parliament did not meet during the summer, so Greta and Anna were allowed to visit both these stately halls. Greta thought they had seen everything in Christiansborg, when Anna suddenly announced, "We're going downstairs now, Greta. The most interesting part of Christiansborg is under the ground."