Something of an off-the-beaten-path adventure due to its location on the remote island of Bornholm (most quickly accessed via ferry from Sweden, actually), Ekkodalen will only disappoint if you're just there to hear the amplified echoes alluded to in its name. Once you've gotten over this minor inconvenience, this kilometer-long crevasse about 60 meters (200 feet) deep will wow you with rock faces that have become a popular challenge for rock climbers in the summer and ice climbers in the winter. If you've forgotten your nylon, then settle for the short hike from the parking area or a jaunt in the adjacent forest of Almindingen. Just don't forget to join in the Danish tradition of yelling "Hvad drikker Moller?" into the void so that you may hear the echo of "Oller! Oller! Oller!" Translation? "What does Moller drink? Beers! Beers! Beers!"
Located at the heart of Bornholm, consider renting a bike and making the trip via one of the island's many cycling routes. There's also a cafe nearby if you're looking to grab coffee or even a full meal.
Note:If rock climbing is your style, head to the northwest coast, where Jons Kapel has drawn climbers to its surf-crashed facade and several small caves beg to be explored.