Sint Pietersberg Tunnels

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Lonely Planet review

Much of Maastricht is riddled with defensive tunnels dug into the soft sandstone over the centuries. The best place to see old tunnels is Sint Pietersberg, a Roman fort 2km south of Helpoort. This is a really beautiful area, pastoral and peaceful - the fort is an arresting sight peeking over the charming hillside - and it's a very relaxing walk from town. If you must, take bus 29, which goes past the fort from Vrijthof.

The Romans built the Northern Corridor System Tunnels throughout the hills over a period of 2000 years; at one stage, the tunnels extended under the Netherlands-Belgium border. Thirteen species of bats have been found living below the surface.