Every year the citizens of Holland celebrate two of their most recognisable symbols - the windmill and the bicycle.

The second Saturday of May each year marks both National Windmill and Pumping Station Day as well as National Cycling Day, when 600 of the country's 1000 windmills welcome visitors for free, while hundreds of thousands of cyclists take to Holland's famously flat streets.

Those on two wheels may want to take the opportunity to explore one of the hundreds of windmills, which indicate they are taking part in the free-entry scheme by flying a blue pennant.

In the few remaining working mills in the country dating back to the 17th and 18th centuries, millers give demonstrations of what their working day is like.

On the day, 360 cycle routes are specially set up for those on two wheels.

Throughout the Netherlands, cycling is an extremely popular method of transportation all year round, with many cycle paths and facilities for cyclists, stretching from city to city and cross-border to Belgium and Germany.