Vinicunca, also known as Rainbow Mountain, is a vibrant geological formation in the Peruvian Andes, known for its colorful layers created by mineral deposits. Due to the high altitude (over 16,000 feet), accessibility can be challenging; visitors should acclimatize to avoid altitude sickness. The trek typically takes a full day (6-7 hours round trip), and guided tours are highly recommended for safety and logistical reasons, although experienced hikers can do it solo. The dry season (May to September) offers the best weather conditions, while the rainy season (November to March) can make the trail slippery and the colors less vibrant. The approximate cost ranges from $30-$100 USD, including transportation, entrance fees, and potentially meals. Consider bringing coca leaves to help with altitude sickness.