One of the UNESCO World Heritage Sites, Chan chan is the largest pre-columbian city in South America. The ruins are located around five km away from Trullijo and 20 minutes from Huanchaco. Chan Chan was constructed by the Chimor (the kingdom of the Chimu). The vast adobe city of Chan Chan was built by the Chimu around AD 850 and lasted until its conquest by the Inca empire in AD 1470. It was the imperial capital of the Chimor until it was conquered in the 15th century. It is estimated that around 30,000 people lived in the city of Chan Chan.
To get to the site from Huanchaco you can catch any city bus going to Trujillo and let the driver know to drop you off at chan chan. From there you can either walk 2 km to the ruins or catch a taxi that will take you right to the entrance.