Volcán de Lodo el Totumo, Colombia
Volcán de Lodo el Totumo is not the kind of towering, stereotypical volcano you might expect. Nonetheless, this rather nondescript geographic feature about 45 minutes outside of Cartagena, Colombia, is a popular attraction. It earns spots on many tourists' itineraries because of its mud baths. The volcanic mud here has a high concentration of calcium, aluminium and magnesium.
Touted by locals for providing a number of health benefits, the mud is especially known as a general tonic for skin health. Massages are offered as part of the soaking experience (tips are expected). Because of its popularity, el Totumo can get crowded at times, though good tour guides or hotel concierges should be able to recommend an off-peak time to visit.