Barranquilla, an hour northeast of Cartagena, hosts the continent's biggest Mardi Gras (Carnaval) celebrations after Rio de Janeiro. For most of the year, the town is a hardworking, busy port town of over a million inhabitants. But come February, for four days the city descends into a rum-soaked bacchanal of masquerade, massive floats with sound systems, public dancing, carnival floats and musical madness. It can be chaotic, irreverent and edgy, but it's always massive fun. Wallflowers need not apply.