Half Dome in Yosemite National Park is a challenging but rewarding hike known for its iconic granite dome and stunning views. Access to the summit requires a permit, obtained through a lottery system, and the use of cables that are typically up for only part of the year (usually late May/early June to October, depending on weather conditions). The hike is strenuous and not recommended for beginners or those with a fear of heights. It's generally considered safer with a guided group, especially for first-timers, though experienced hikers can tackle it solo. The entire hike usually takes 10-12 hours, so plan for a full day. The cost involves park entrance fees and potentially guided tour fees if you opt for a guided experience. Accessibility to the trailhead is generally good within the park, but the hike itself is not accessible. Be aware of potential seasonal restrictions due to snow and ice, which can make the cables and trail dangerous.