Although it is only a 20th century creation, Palace Bridge is undoubtedly one of the most famous sights of St. Petersburg, and is quite literally unmissable for most visitors to the city, who will find themselves continually using the bridge to move between Palace Square, home to the Winter Palace and the Hermitage Museum, and the numerous historic attractions on Vasilevskiy Ostrov. Despite the grandeur and extravagance of the surrounding architecture, Palace Bridge itself is a relatively simple structure, comprising five cast-iron spans resting on granite-clad, packed-rubble piers. Height of the bridge was strictly limited, so as not to obstruct the view of the monuments around. The central span of the bridge splits into two wings, which are raised through an angle of over 45° to allow ships to pass up the Neva River, and the view of the golden spire of the Ss. Peter and Paul Cathedral between the two raised wings is one of the most widespread and memorable images of St. Petersburg. It also makes Palace Embankment the centre of nightly celebrations during the White Nights, when thousands of locals and visitors gather to watch Palace Bridge open in the small hours. http://www.saint-petersburg.com/bridges/unmissable-palace-bridge/

This Church was built on the site where Emperor Alexander II was severely wounded and died in March 1881.The church was built from 1883 till 1907. The construction was funded by the imperial family. Architecturally, the Cathedral differs from St. Petersburg's other structures. The Church contains over 7500 square meters of mosaics—according to its restorers, more than any other church in the world. The walls and ceilings inside the Church are completely covered in intricately detailed mosaics — the main pictures being biblical scenes or figures — but with very fine patterned borders setting off each picture. http://www.visit-petersburg.ru/en/showplace/195645/