A Common theme issue (Czech Republic 2016)

Stamp A Common theme issue it reflects the thematic directions:

The Department of Environment and Conservation (DEC) was a department of the Government of Western Australia that was responsible for implementing the state's conservation and environment legislation and regulations. It was formed on 1 July 2006 by the amalgamation of the Department of Environment and the Department of Conservation and Land Management. 

Classical antiquity, also known as the classical era, classical period, classical age, or simply antiquity, is the period of cultural European history between the 8th century BC and the 5th century AD. It comprises the interwoven civilizations of ancient Greece and Rome, known together as the Greco-Roman world, which played a major role in shaping the culture of the Mediterranean Basin. It is the period during which ancient Greece and Rome flourished and had major influence throughout much of Europe, North Africa, and West Asia. Classical antiquity was succeeded by the period now known as late antiquity. 

Architecture (Latin architectura, from the Greek ἀρχιτέκτων arkhitekton "architect", from ἀρχι- "chief" and τέκτων "builder") is both the process and the product of planning, designing, and constructing buildings and other physical structures. Architectural works, in the material form of buildings, are often perceived as cultural symbols and as works of art. Historical civilizations are often identified with their surviving architectural achievements.