The 100 Bridges Run takes you along the most beautiful sites of the historic city center of Leiden. The buildings of the oldest university in the country, the Hortus Botanicus, the brand new Singelpark, the historic harbor, city gates, industrial monuments, a district full of special new architecture: Leiden shows itself from its best side. You can either choose the full 19 km version with 100 bridges or the shorter 10 km (52 bridges). If you prefer walking, you can choose your own distance. But the challenge of course is to walk all 100 bridges and 19 km.