- commons.wikimedia.org wiki/File:Engineers'_…share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
- life-globe.com en/engineering-house-peter-and-…The Engineering House is a historical building and a unique example of the "Peter's Baroque", located on the territory of the Peter and Paul Fortress...
- http://saint-petersburg.com museums/peter-paul-fortress/…The Peter and Paul Fortress includes several buildings constructed in wide range of architectural styles and for a huge variety of different purposes, ranging...
- rbth.com arts/337703-facts-peter-and-paul-fortressThe fortress is considered the oldest building in the city. Peter the Great chose Hare Island for its construction not by chance: it is located in the widest point of...
- en.wikipedia.org Peter and Paul FortressThe Peter and Paul Fortress is the original citadel of Saint Petersburg, Russia, founded by Peter the Great in 1703 and built to Domenico Trezzini's designs from 1706 to 1740...
- http://famous-historic-buildings.org.uk page_146.htmlIn 1706 work began on the stone fortress to replace the wooden and earth one and in 1712 work began on the construction of the stone St Peter & Paul...
- http://worldwalk.info en/catalog/74/Construction of the Peter and Paul Fortress (the Fortress, for short), which laid the foundation of Saint Petersburg, started on 16th May 1703.
- vogueindustry.com HistoryThe Peter and Paul Fortress acquired its museum significance in 1766, when a building was built on its territory to accommodate Peter the Great's boat...
- en.tripadvisor.com.hk Attraction_Review-g298507-…Peter & Paul Cathedral, part of the Fortress built by Peter the Great, founder of St Petersburg, is the burial place of the Czars including the last Czar...
- visitrussia.com citiesguide/spb/places/peter_and_…The fortress was founded on Hare Island 16 (27) May 1703 by the joint plan of Peter I and French engineer Joseph-Gaspard Lambert de Guerin.