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On the sign:
TOURIST GUIDE MAP CAMBRIDGE HISTORIC CENTER
Rotary symbol
CELEBRATING 100 YEARS OF COMMUNITY SERVICE BY ROTARY INTERNATIONAL: 1905-2005 PROVIDED BY THE ROTARY CLUBS OF CAMBRIDGE, SOUTH CAMBRIDGE, CAMBRIDGE RUTHERFORD, & SAWSTON DISTRICT
The map depicting the historic center of Cambridge in relief was donated by the Rotary organization on the occasion of 100 years of activity in the city.
The map is on a column and resembles a round table, as you can see in the following photo taken that day Click for a larger image
Another map placed under the auspices of the same organization, but its shape is hexagonal is also found on the site Click for sign's details