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- en.wikipedia.org Kronstadt FortressThe Kronstadt Fortress is an architectural and historical monument of the 18th–19th centuries in Saint Petersburg, Russia.
- kronshtadt.net history/Peter the Great baptized his beloved child, and after a solemn prayer service, cannon shots announced to Europe that the new fortress was called Kronshtadt.
- spottinghistory.com view/1897/kronstadt-fortress/Kronshtadt, also spelled Kronstadt, Cronstadt is a large fortress and St. Petersburg's main seaport.
- tripadvisor.com Attraction_Review-g2394587-…Kronstadt was founded by Emperor Peter the Great in 1704 as a maritime fortress and naval base on Kotlin Island.
- eng.navalmuseum.ru filials/kronstadt-fortressContacts branch of the Central naval Museum "of the Kronstadt fortress"
- brilliant-tourism.com 12520159-kronstadt-fortress…Due to the constant threat of war with Sweden, the Kronstadt fortress was kept on alert and modernized in armament.
- apel-sin.com kronstadt/As a result, a unique fortress and harbor was built. The construction and development of fortifications continued in Kronstadt until the beginning of the 20th century.
- commons.wikimedia.org wiki/Category:Kronstadt_…Kronstadt-Fortress-8891.jpg 5,184 × 3,456; 6.7 MB.
- visit-saint-petersburg.ru kronstadt-fortress/Built as an island fortress and developed into a major naval base, Kronstadt was considered a site of military significance and was off-limits to foreigners.
- modern-info.com 13659810-museum-of-the-kronstadt-…The Kronstadt Fortress Museum (St. Petersburg) opened its doors to visitors in May 1980, on the eve of Victory Day.