LIMA
Wikipedia - Callao
Wikipedia - Lima
Wikipedia - Historic Centre of Lima
Peru Travel - Callao
Peru Travel - Lima
Lima Walking Tours
Andy & Judi Patterson's 2015 Blog
From Princess:
1-2 August - Walk among the remnants of the Inca Empire at Pachacamac Ruins. From Lima, you have the opportunity to take an optional overland tour to the magical ‘Lost City of the Incas’, Machu Picchu a UNESCO World Heritage Site.