Starting Map

Create a leaflet map object.

library(leaflet)
map <- leaflet() %>% addTiles()

Create a marker with a picture of the Taj Mahal.

tajmahalIcon <- makeIcon(
   iconUrl = "https://png.pngtree.com/png-clipart/20190520/original/pngtree-travel-and-destination-taj-mahal-icon-with-outline-style-png-image_3993275.jpg",
   iconWidth = 30*408/255, iconHeight = 30,
   iconAnchorX = 30*408/255/2, iconAnchorY = 30/2
)

Add the marker to the map and display the map.

map %>%
   addTiles() %>%
   addMarkers(lat=27.1750151, lng=78.0421552,popup='Taj Mahal',icon=tajmahalIcon)