The mangrove tunnels of nearby La Boquilla are an easy day trip from Cartagena. Guided tours will often combine a visit to the beach (one of the Playas De La Boquilla) with a boat or canoe tour of the mangroves, passing through Cienaga de Juan Polo and the Cienaga de la Virgen lagoons. Some tours will also include a closer encounter with local fishermen and offer insight into their craft. La Boquilla is an area of contrasts: the district of upscale hotels — Morros — borders on humble neighbourhoods populated by workers. When sitting down to tuck into no-frills seafood dishes served up by local eateries, make sure you're clear about the price of each item ordered from the get-go, as there have been reports of "surprise" bills amounting to several hundred US dollars.

The Basilica of San Clemente is more than a simple church; it is a real museum that houses layers and layers of history. Behind the humble doors of this 12th-century church lie the remnants of the original basilica dating back to the 4th century, the remains of a 1st-century Roman villa, and breathtaking Byzantine mosaics beautifully adorning the ceiling.

Sandwiched between the Palatine and Capitoline hills, the Forum Romanum (Roman Forum) is an open-air forum that was once the commercial, political, social, and religious hub of ancient Rome. Throughout the Imperial period, Emperors like Julius Caesar and Augusts expanded the Forum to include temples, statues, monuments, a senate house, and low courts. Today, the Forum Romanum is one of the most visited archaeological sites in the world and offers fascinating insights into Roman civilisation.