Step into the awe-inspiring Real Felipe Fortress, an iconic military construction that's as grand as it is historical. Built to protect Callao's valuable port from pirate attacks and naval threats, the fortress is a testament to the area's strategic importance throughout history. Walk through the district's colonial streets, taking in the grandeur of its aged architecture. Another high point is Casa Ronald, a 1920s structure that's now an important art gallery. Don't miss Grau Square, named after one of Peru's naval heroes. If you're looking for something a bit more adventurous, there's even the option to take a boat ride to see the historic Abtao Submarine and a famous war cannon, offering an entirely new perspective on this fascinating district.