The Begijnhof is one of Amsterdam’s oldest inner courtyards, and is a surprisingly tranquil escape from the city commotion. Formerly home to the Beguines – a group of unmarried religious women who chose to live together in a close community – this quaint medieval enclosed court houses a group of historical buildings arranged around a central green, including the oldest wooden house in Amsterdam. It’s a surreal experience and well worth finding the discreet entrance via the Begijnensteeg, off the Kalverstraat.
Alternative tip: Explore some really secret courtyards during Open Garden Days, when some of Amsterdam's most impressive private canal houses open up their normally-hidden gardens to the public for one weekend every June.