The Alexander Nevsky Cathedral in Tallinn is a stunning example of Russian Revival architecture, offering a glimpse into Estonia's complex history. It's generally accessible, though assistance may be needed for those with mobility issues due to steps. Exploring solo allows for independent discovery, but a guided tour enriches the experience with historical context. There are no significant seasonal restrictions, though opening hours may vary. Entry is free, but donations are welcome. A typical visit lasts about 30-60 minutes.