The Mariinsky Palace in St. Petersburg, Russia, is a significant historical and architectural landmark, primarily serving as the home of the Legislative Assembly of Saint Petersburg. While internal accessibility details may vary and should be checked in advance, the exterior can be admired by all. Visiting solo allows for flexible exploration of the surrounding area, but a guided tour (if available) can provide deeper historical context. Be aware that access to the palace interior might be restricted due to governmental activities or special events, so it's advisable to check the official schedule beforehand. The cost mainly involves transportation and potential tour fees, with a typical visit lasting around 1-2 hours for exterior viewing and longer if a tour is available. Photography restrictions might apply inside.