Coudenberg, Former Palace of Brussels, Belgium
Beneath one of its busiest squares, Brussels has a secret. As tourists dodge traffic and trams on Place Royal, darting between the Magritte Museum and the Bozar, most of them are unaware that right beneath their feet is a hidden palace – Coudenberg, the former palace of Brussels.
Once upon a time, in the middle ages, a grand palace overlooked the city of Brussels, from Coudenberg hill. These days, a new palace (and a handful of museums) sits in its place. However, the remains of Coudenberg Palace and Rue Isabelle, an ancient thoroughfare , still exist – underground.