Founded more than 150 years ago, the Bürgerpark has more than enough space for people to relax or take part in sport. There's any number of ways of keeping active here – running, cycling, rowing on the lakes or playing mini golf. Children can let off steam in the many playgrounds or visit their furry friends (goats, sheep and guinea pigs) in the open air animal enclosures. The grassy meadows are the perfect place to have a picnic. Alternatively, there's a great selection of refreshments available at any of the park's four restaurants. The municipal forest is located right next to the Bürgerpark. Its lake (also known as the Unisee (university lake)) is a wonderful place for swimming in summertime.

Founded in 2001, this museum is devoted to showing the rise and fall of the labor camp system in Russia called Gulag. Here you can find both permanent and temporary exhibitions as well as concerts and events.

A feat of Spanish colonial military architecture, the Castillo San Felipe de Barajas is one of Cartagena's most prized attractions. The fortress, whose construction finished in the late 18th century, was never seized — and not for a lack of attempted forays. Part of its sophisticated system of underground tunnels is open to the public. A guided tour (audio guides available) is highly recommended.