The Imam Khomeini Mosque, also known as Shah Mosque or Royal Mosque, is a must-visit architectural masterpiece located within Isfahan's Naqsh-e Jahan Square, a UNESCO World Heritage site. Access is generally straightforward, with the main courtyard and prayer halls being relatively accessible, though some steps are present; wheelchair access might be limited in certain areas. Both solo visits for self-paced admiration and guided tours for deeper historical and architectural insights are highly recommended, with local guides readily available. The mosque is open year-round, but spring (March-May) and autumn (September-November) offer the most pleasant weather for exploration; visitors should be mindful of potential crowd increases during public holidays like Nowruz and limited access during Friday prayer times. The approximate cost for foreign tourists is a modest entrance fee (e.g., around 500,000 IRR, subject to change), with additional costs for a guide. A typical visit duration ranges from 1 to 2.5 hours, allowing ample time to appreciate the intricate tile work and iconic acoustics under the main dome. Visitors must adhere to modest dress codes (including a headscarf for women) and can enjoy photography while being respectful during prayer times. It is best visited early morning or late afternoon for optimal lighting and fewer crowds, and it seamlessly integrates into a visit to the other magnificent attractions surrounding Naqsh-e Jahan Square.