Huilo-Huilo, Chile: Like a rainforest theme park
It looks less like a hotel tucked inside a UNESCO Biosphere Reserve than a CGI set piece from Avatar.
It's a hotel built in a man-made volcano that spews water instead of lava, that's covered in rainforest moss and vines and is accessible via monkey bridge, sitting within a reserve that's 232 square miles of lush, teeming nature.
Soak in outdoor hot tubs carved from the trunks of giant trees as you gaze out across central Chile's Huilo-Huilo Biological Reserve, playing Spot the Puma (or any of the other wildlife species that roam near the Montaña Mágica Lodge—including the world's tiniest deer, the pudú, which stands about 13 inches tall, like a free-roaming rainforest dachshund).
Nearby, you can play a wild course of mini-golf, where each hole's obstacle is part of the natural terrain, hike trails, trails and more trails, and brave the longest zip-line in South America (known as "canopy" around these parts), which runs just shy of 1500 death-defying feet (we suggest a change of underwear).
Then retire to your volcano and dine on Chilean specialties like the pastel de papas (a potato tart) at the Mesón del Bosque restaurant. And fall asleep to the sound of the waterfall rushing right outside your window.