Things to do in Poland

One of Europe's largest medieval town squares, anchored by the Cloth Hall and St. Mary's Basilica, whose trumpet call still sounds hourly from the tower.

The most visited Holocaust memorial site in the world, preserved on the grounds of the former camp — a sobering but essential half-day, best with a guide.

A working mine since the 13th century, with entire chapels, chandeliers, and sculptures carved from rock salt hundreds of feet underground.

Rebuilt almost entirely after WWII from paintings and photographs, now a UNESCO site that looks — deliberately — as if the war never touched it.