library(leaflet)
library(magrittr)

The map below shows the location of Starbucks shops in the US in 2012.

# 2012 Starbucks locations
# data source: https://github.com/libjohn/mapping-with-R/blob/master/data/All_Starbucks_Locations_in_the_US_-_Map.csv

starbucks <- readr::read_csv("https://raw.githubusercontent.com/libjohn/mapping-with-R/master/data/All_Starbucks_Locations_in_the_US_-_Map.csv",
                             show_col_types = FALSE)
starbucks %>% 
  leaflet() %>%
  addTiles() %>%  # Add default OpenStreetMap map tiles
  addMarkers(~Longitude, ~Latitude,
  clusterOptions = markerClusterOptions()
)