Yes. the most known one is the St. Louis arch. but there are churches and plenty of other tourist attractions
Generally its the older commercial building that have the Roman or Greek architecture. These could be banks, board of trade buildings, or any building that has to do with commerce or finances. (The modern buildings tend to be steel and glass). Roman touches can be seen in the atria of office buildings, waiting rooms or reception areas.
Art is drawing, sketching, painting, sculpture of any subject except buildings and spaces. Architecture is the design of buildings and spaces.
There are buildings in Ireland that are over 5000 years old, right up to buildings currently under construction, so no one year can be said to be when Ireland's architecture was made. Georgian architecture is particularly famous in Ireland's cities, but that cannot be attributed to any one year. Georgian architecture refers to styles of buildings built in the 18th and 19th centuries, and buildings similar to those, that have been built at other times.
any football stadium
There aren't any really good books focusing specifically on steel buildings. However, all the standard textbooks on architecture include sections on steel buildings and these would probably be the best starting point.
Like any country, Ireland has all sorts of architecture, so there is no simple answer to the question. You will find all kinds of architecture in buildings of different ages. Ireland has buildings that are 5000 years old, which is older than the pyramids in Egypt. Dublin in particular, but also some other Irish cities, is famous for Georgian Architecture. It dates from the early 18th century through to the early 19th century. Lots of more modern buildings have been built in the Georgian style too, in order to fit in with surrounding buildings.
Yes
Sparta did not have any memorable buildings, although architecture was an important part of their culture. Their houses were extremely rough and basic and most buildings were purely for religious needs.
The answer to this question depends on the what architecture you are asking about. The buildings in Spain reflect the various cultures and eras that were in charge in Spain at any given time, so your question can not be answered with one broad stroke.
You could do like psychical development/growing up. The evolution of man/animals. Changes in architecture e.g. buildings, styles of buildings. Or even the progression of society. =)
Modern architecture is no longer influenced by the Romans much. It was until the early to mid-20th century. Successions of European architectural styles were influenced by Roman architecture: Renaissance (15th and 16th centuries) Baroque (17th to early 18th centuries), Rococo (18th century) and Neoclassicism (late 18th to 20th century). These styles were popular for public buildings, palaces, mansions and town houses for the rich and well-to-do. The Neoclassical style is still sometimes used.
Athena is the Greek Goddess of Architecture, as well as knowledge. There was grand buildings that still stand today made in her honor. Hope this helps in any way! :)