Which three ancient greek and roman architectural features do modern architects use today?

Three of the most common ancient Greek and Roman architectural features that we see today are columns, domes, and arches. On a side note, the Romans were also responsible for the widespread use of concrete because they discovered it was stronger than the commonly used marble and could be shaped instead of needing to be carved.   

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.