St. Basil's Cathedral, officially known as the Cathedral of Vasily the Blessed, is a vibrant and iconic landmark in Moscow's Red Square. Its unique architecture, featuring colorful onion domes, makes it a must-see. Accessibility can be challenging due to the historic nature of the building; inquire in advance about ramps and elevators. While solo exploration is possible, guided tours offer deeper insights into its history and significance. Be mindful of large crowds, especially during peak tourist seasons (summer and holidays). The interior can be explored for a separate fee (approximate cost varies but is generally affordable), and a typical visit lasts between 1-2 hours. Photography is usually permitted, but check for any restrictions upon entry. Note that access to some parts of the cathedral may be restricted during religious services.