Once upon a time, the Coudenberg Palace towered over the city of Brussels. Charles V and many other of the most powerful rulers ever to reign in Europe made this princely residence their home between the 12^th and 18^th centuries, until it was consumed by a terrible fire.  Every trace of this prestigious palace simply disappeared underground for many years. Today, however, these ruins constitute a fascinating archaeological site incorporating a network of underground passages and chambers.

When you visit it you can explore the principal buildings of the palace and enjoy a stroll along the Rue Isabelle, which is now underground.