Pompeii and Machu Picchu are two of the most famous ancient ruins in the world. Pompeii is an ancient Roman city located near modern-day Naples, Italy, that was destroyed by a volcanic eruption in 79 AD. Machu Picchu is an Incan citadel located in the Andes Mountains of Peru that was built in the 15th century. Both sites are popular tourist destinations and have been designated as UNESCO World Heritage Sites.