There are more than 400 hotels in the TUI Group. The establishments managed by our brands are situated in upscale surroundings in popular tourist areas and offer a range of hotel formats with high standards for operational efficiency, customer satisfaction, and environmental management. German leisure, travel, and tourism business TUI Group. Touristik Union International is known by the abbreviation TUI. Prior to 1997, when the company switched from mining to tourism, it was known as Preussag AG. Its main office is in Hanover, Germany.