In Austria, find one of the world's most unique parks. Warning – you'll need a snorkel to visit.
It might not be the lost city of Atlantis, but Austria's Grüner See is certainly an underwater visual treasure. Most of the year, visitors can walk around the park, over footpaths, bridges, and sit on benches. But every summer, snowmelt from the Karst mountains means the park is suddenly submerged in cold, clear, water. Scuba diver Marc Henauer from Switzerland nabbed these incredible photos. Getting the full set of shots wasn't easy, and in fact, it took quite some time. “My wife and I stayed there for seven days,” says Henauer. “We did three dives every day, spending one hour on each dive.”
A submerged seat
This bench, normally above the water surface, could work kind of like a hot tub, letting you keep just your head above water. One problem: lakes formed by snowmelt aren't exactly 'bathing temperature'.