Fort Abcoude is the oldest land fort of the Defence Line of Amsterdam and the only fort of the line made of bricks. The site consists of a main building with a gunpowder magazine, a cistern and sleeping quarters. The outer walls are 1.8 metres thick! From the vantage point on the eastern orillon, you can see Fort Nigtevecht.
Fort Abcoude was built between 1884 and 1887. It fell out of use soon after World War I. Because of the invention of the high-explosive shell, the fort was no longer bomb-proof.