Bing found the following results
Heidelberg - Wikipedia
15 Best Things to Do in Heidelberg (Germany) - The Crazy Tourist
Heidelberg | Germany, Map, History, & Facts | Britannica
THE 15 BEST Things to Do in Heidelberg - Tripadvisor
15 Top-Rated Attractions & Things to Do in Heidelberg
Heidelberg travel - Lonely Planet | Germany, Europe
13 Magnificent Things to Do in Heidelberg, Germany (+ Our Tips)
heidelberg.de - Visit
Romance at its best: Heidelberg - Germany Travel
heidelberg.de - The City