The Peter and Paul Fortress was founded by Peter I in 1703 as the fortification building on Zayachy Island. Apart from the ancient fortifications, on the grounds of the fortress one can visit the Peter and Paul Cathedral (the first half of the XVIII century, D. Trezzini) with the tombs of Peter the Great and other Russian Tsars, the Trubetskoy Bastion casemates and the following permanent exhibitions: "The History of Saint-Petersburg", "The History of Missilery and Cosmonautics. Gas-dynamic Laboratory", "The History of the Imperial Mint", "Petchatnaya". There is a new excursion route "Nevskaya Panorama" along the roofs of fortifications. After a special order in the warm season you can have an opportunity to enjoy the panoramic view of Saint-Petersburg from the Air balloon.