#1 Meeting place for Third Reich and Street Art tours:
Neues Rathaus / new town hall
Marienplatz underneath the Glockenspiel tower
(the one with the figurines)
Look for the green sign with yellow lettering

#2 Meeting place for the Cold War tour:
Frauenkirche cathedral at Frauenplatz 1
(the church that looks like salt & pepper shakers)
At the fountain by the cathedral‘s front door
Look for the green sign with yellow lettering