Original: Some undemolished remains of one tower of the fort were discovered during excavation for the Métro ( rail mass-transit system ) in 1899 , and were moved to a park ( the Square Henri-Galli ) a few hundred meters away , where they are displayed today .
Simplified: The remains of one tower of the fort were found during digging for the Métro ( rail mass-transit system ) in 1899 .