Trump’s promises of America’s golden age stretch equally far and wide—extending as in ancient Athens far beyond economics to civic life, culture, national security, and even public architecture.

T he way to start a “golden age” is to erect big, beautiful barriers to keep out foreign goods and people. That, at least, is the view of the most powerful man on the planet.

Travel Guide: Athens is a treasure trove for history lovers, blending ancient ruins with centuries of culture. Walk in the footsteps of philosophers, gods, and emperors as you explore landmarks ...