Colonial Drug

Since 1947, this has been one of the best resources in the region for impossible-to-find beauty products (it counts a stock of more than 1,000 fragrances); it looks much as it did when it first opened, with deep glass cases and two-foot-high archetypes of famous perfume bottles. And it still doesn't accept credit cards.
49 Brattle St., Harvard Square, 617-864-2222