The Germans have always been big music lovers, and Cologne is no exception. Cologne Opera is the main opera house in the city, featuring modern architecture, a resident opera company and a rich cultural program. It can accommodate up to 1,300 spectators and 100 orchestra musicians.

Situated half an hour southwest of Groningen, Plaza Posta is an all-embracing activity centre suitable for groups of all themes and sizes, be it family or work events. With over a dozen programmes from escape games to bowling to outdoor tours, it's all up to your definition of fun. For the essential bites and drinks, the historic De Postwagen restaurant provides a variety of options including high tea, buffets and barbecue. It's advisable to enquire beforehand about opening hours and availability, including those of the restaurant, as they may be subject to large group bookings.

This well-known modern art centre is based inside a defunct, 1950s concrete factory with works of artists from all over the world. It features photographic exhibitions, video installations, sculptures and other artwork. Displays change regularly. Restaurants and cafes serve fabulous food.

This botanical garden housing about 10,000 types of plants dates back to the 19th century and is beautifully located along the Rhine River. The main greenhouse alone, with its great assortment of plants, is worth a visit. It'll feel like you're in South America's rain forest surrounded by its exotic vegetation.