Most tourists come to leafy, upscale Wannsee to see the House of the Wannsee Conference, where the Third Reich’s top officials met to plan the "final solution." Beyond this dark historical site, however, there are parks, lakes, and islands to explore. Leave a day for a trip here, especially in warm weather: the Wannsee lake is a favorite spot for a summer dip.

- Photo: Christian Draghici / Shutterstock