The Congress of the Argentine Nation offers free guided tours, which are highly recommended for visitors to explore its grand architecture and historical significance; solo visits are generally limited to the exterior. Tours, typically lasting 60-90 minutes, are usually offered on specific weekdays and require advance booking, often available in Spanish and sometimes English. While efforts are made, accessibility for those with mobility issues might be limited in certain historical sections of the building due to its age. There are no seasonal restrictions per se, but tours can be suspended during legislative sessions, official events, or public holidays, so checking the official schedule beforehand is essential. Expect mandatory security checks; photography rules may apply inside.