Tonhalle, home to the 'Düsseldorfer Symphoniker', also hosts many international guest performances. The city's orchestra consists of 130 musicians, and with its many tours in this country and abroad has made an excellent name for itself far beyond the city borders.

A visit to Cancún is not complete without a trip to the famous Mayan ruins. Chichen Itzá, one of the New Seven Wonders of the World, is an absolute must. Equally stunning is Cobá, currently the only ruin that can still be climbed, offering a breathtaking view over the jungle and Tulúm, with its spectacular backdrop of the clear turquoise water of the ocean.

Enclosed by the GUM, Kremlin, and Saint Basil's Cathedral, the Red Square stands proud. This is also the place where Lenin rests in his mausoleum. Since 1924 he has been as carefully guarded as he was embalmed.

Cenotes (sinkholes) are deep wells with crystal clear water that can be accessed when the roof of a cave collapses. Fed by underground rivers, the cenotes were the main source of freshwater for the Mayans and therefore are considered sacred. They are unique to the Yucatán peninsula, and still to this day, the underground cave system connecting all the cenotes remains largely unexplored. Witnessing the breathtaking beauty of the large clusters of stalactites and stalagmites being mirrored in the crystal clear cool waters is a unique experience. Every cenote has its own particular beauty, and putting on a swimsuit and snorkeling in the pool is an absolutely unforgettable experience. Some tour operators also offer cave diving excursions for very experienced divers.