Venus Hill
Charlotte Amalie, United States
Venus Hill (also known as Venus Pillar or Mafolie Observatory) is a historic site on Estate Mafolie in Charlotte Amalie, U.S. Virgin Islands, marking the spot where, in 1882, a transit of Venus was observed and recorded. The monument was added to the National Register of Historic Places in 1978.
Observatory data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).