1. The Ancient Footprints of Acahualinca, located in Managua, Nicaragua, are a set of pre-Columbian footprints preserved in volcanic ash. These footprints are estimated to be around 2,100 years old, making them some of the oldest human remains in the Americas. The footprints provide valuable insight into the lives of the ancient inhabitants of the region, as well as the geological history of the area. The site also features a small museum with exhibits on the history and culture of the region.

2. The site is open to visitors from Monday to Sunday, from 8:00 am to 5:00 pm. The phone number for the site is +505 2278 5181.

3. The entrance fee for the Ancient Footprints of Acahualinca is typically around $5 for adults and $1 for children. The site is easily accessible by public transportation or taxi from the city center of Managua. Visitors can also opt to take a guided tour to learn more about the history and significance of the footprints.