Top 10 Extreme Vacations

Spelunking

Rappel down the side of a limestone cliff, squeeze through damp crevices covered with luminescent glow worms, leap from a subterranean waterfall, and go "black-water rafting" in the underground rapids at Ruakuri Cave, part of the otherworldly Waitomo cave system in New Zealand. The five-hour Black Abyss adventure offered by The Legendary Black Water Rafting Co. is the most challenging of the region's guided tours, with a mix of climbing, rappelling, and cave tubing.

Low-Adrenaline Alternative: For a less-demanding domestic descent, go to Carlsbad Caverns National Park in southern New Mexico. Rather than rivers and waterfalls, the 300 caves here were carved out by limestone-dissolving sulfuric acid, making for a much drier – yet still "deeply" satisfying – experience.

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