The yellow building is the Orangerie Palace, built for Landgrave Karl (1654-1730) as a summer residence and place to keep his Mediterranean pot plants in winter. Today it houses a restaurant, a museum for astronomy and physics, and a planetarium. The Aue-Pavillon, a temporary building erected for Documenta 12, faces the Orangerie. You can see a bit of it on the right and more in the next photo.
The web's original travel blog
%20as%20a%20summer%20residence%20and%20place%20to%20keep%20his%20Mediterranean%20pot%20plants%20in%20winter.%20Today%20it%20houses%20a%20restaurant%2C%20a%20museum%20for%20astronomy%20and%20physics%2C%20and%20a%20planetarium.%20The%20Aue-Pavillon%2C%20a%20temporary%20building%20erected%20for%20Documenta%2012%2C%20faces%20the%20Orangerie.%20You%20can%20see%20a%20bit%20of%20it%20on%20the%20right%20and%20more%20in%20the%20next%20photo.){kind=link}