I am showing the code of the map for the benefit of the marker.
library(leaflet)
df <- data.frame(name = c("Via Nievo", "Via XX Settembre", "Pontormo",
"DM Unipi", "Angus Drive", "Walton High",
"Bedford Town Hall"),
lat = c(43.72238325192714, 43.719234607336155,
43.71571261599621, 43.71966404407325,
52.00558407005514, 52.04695793845052,
52.136074493511614),
lng = c(10.956351064309342, 10.95310027322172,
10.933656425339382, 10.407605611847194,
-0.7509671726104704, -0.6743478609684557,
-0.4682699541806367))
popups <- c("I was born here", "I grew up here", "I studied here",
"I became a Mathematician here", "I live here",
"I work here", "I got married here")
df %>%
leaflet() %>%
addTiles() %>%
addMarkers(popup = popups, clusterOptions = markerClusterOptions())
## Assuming "lng" and "lat" are longitude and latitude, respectively