1) In Greek mythology, the Trojan War is a legendary conflict between the city of Troy and the Greeks, sparked by the abduction of Helen of Troy. It is immortalized in Homer's epic poems, the Iliad and the Odyssey, and features famous heroes like Achilles, Hector, and Odysseus.

2) The banking industry is regulated by government agencies to ensure the stability and integrity of the financial system and to protect consumers.

3) The Alps, located in Europe, are a popular destination for skiing, mountaineering, and hiking.

4) The concept of federalism involves the division of powers between a central government and regional or local governments, allowing for shared governance and autonomy for different levels of administration.