As you proceed along Damrak, look to your left. Back in the Middle Ages, this canal was the mouth of the Amstel river before emptying into a bay simply named IJ. Admire the row of tall, narrow gabled buildings. These handsome canal houses (grachtenpanden) from the 17th century are the Dancing Houses. They are part of the oldest section of the city. One nearby at Warmoesstraat 90 is dated at 1485. Next you will see Beurs van Berlage. This large brick building was the Amsterdam Stock Exchange from 1903 until 1998.