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.

Circus World boasts ten different shows each day from May to September, rain or shine. See the world’s largest collection of parade wagons, as well as seven authentic Ringling Bros and buildings filled with colorful, big top wonders. Enjoy elephant, pony and carousel rides, yummy cotton candy, ice cream, tasty sandwiches, and two gift shops. Circus World opens seasonally, so it's important to check their calendar on their website before planning your trip.

This beautiful example of Spanish colonial architecture contains a small museum dedicated to the Spanish Inquisition's brutal persecution of heretics once carried out in these very chambers. Visitors can still see some of the torture devices used to extract confessions of heresy and witchcraft, along with some of the questions used in "witch" interrogations, which are still displayed on the museum wall. Needless to say, no prisoner could hope to be acquitted of their purported crimes against the Catholic Church, and most met their tragic end at the very guillotine still on display in the courtyard.