Directions:

Michaelisplatz, Hamburg was the discovery site of phosphorus in 1669. Mitchaelisplatz itself no longer exists, but was in the vicinity of St. Michaelis Kirche.
RR Station, Hachmannplatz 16 - N53 33.23 E10 00.48.
St. Michaeliskirche, Englische Planke 1a - N53 32.90 E9 58.67.
Michaelisbrücke (Michael's Bridge) spans the ancient boundary between Old Hamburg and New Hamburg; New Hamburg (at that time) was on the west side (St. Michaeliskirche side) - N53 32.96 E9 59.06.