Getting there: By ferry Buquebus operates the ferries between Buenos Aires and Colonia (011-54/11-4316-6500, buquebus.com). Expect to pay $37 each way for the fast ferry or $19 each way for the three-hour boat. A one-way taxi to the Hipódromo costs about $6.50. Everything else in town can be reached by foot.
These places have been inspiring more than just vacation ideas for centuries. Long revered for their gorgeous scenery and spiritual power, here are ten natural wonders—from a ceremonial Mayan lake to the home of Shiva—that are the stuff of legend.