Directions:

In Heidelberg the elements rubidium and cesium were discovered by Bunsen and Kirchhoff with their newly developed spectroscopy; Heidelberg also holds a pharmacy/alchemical museum of interest.
RR Station, Kurfürstenanlage - N49 24.28 E8 40.56.
Hörsaal Zentrum Chemie (Lecture Hall, Chemistry), which holds an impressive display of chemical and spectroscopic equipment utilized by Bunsen and Kirchhoff, new campus of Heidelberg University, Tomstrasse, Im Neuenheimer Feld 252 - N49 25.11 E8 40.38.
Bunsen Statue in Altstadt (Old City), Hauptstrasse 51 - N49 24.64 E8 41.89.
Bunsen House/Lab, Plöck 55 - N49 24.62 E8 41.87.
Alte Universität, Universitätsplatz - N49 24.70 E8 42.36.
Heidelberg Schloß (castle), holds Deutsches Apotheken Museum (alchemical and pharmacy museum), Schlosshof 1 - N49 24.56 E8 42.81.