Exercise 3 - Two dates and what a visitor sees (sample answer)

1241-42 (Mongol invasion): many early churches and towns were destroyed, and
the crown then encouraged stone castles, so a visitor sees castle-building of
the 13th and 14th centuries rather than much earlier fabric (Chapter 2).

1944-45 (siege of Budapest): the Danube bridges and the Castle were badly
damaged, so the bridges a visitor crosses are rebuilt or new, and parts of
the Castle are post-war work (Chapters 5 and 8; check details).

Any two dates from the table are fine if each has a clear, specific effect.