Boca do Inferno market
Time Out says
The people of Cascais have gone to the Boca do Inferno market for decades to buy warm woollen jumpers and sheepskin slippers. Believe us, once you’ve tried the slippers, you won’t want to wear anything else all winter. There is also a number of stalls selling Portuguese plates, many of them hand-painted, which make excellent souvenirs. The stalls are open every day, and even if you don't buy anything, they make for a good stroll after taking a peek at the Boca do Inferno.