sentences:  In 2004, it was placed on the "World Heritage in Danger" list, as the only Western site in danger, due to plans to construct several high-rise buildings nearby, which would have visually impacted the site.The cathedral was removed from the list in 2006, following the authorities' decision to limit the heights of buildings constructed near and around the cathedral.As a World Heritage Site and host to the Shrine of the Three Kings, Cologne Cathedral is a major attraction for tourists and pilgrims, and is one of the oldest and most important pilgrimage sites of Northern Europe.