Start your trip by visiting two UNESCO World Heritage Sites. At Humayun's Tomb, marvel at the intricate details of Mughal architecture, and stroll through the lush gardens. Next, head to Qutub Minar to see the tallest brick minaret in the world. While you're there, explore the surrounding ancient ruins of the Qutub Complex.
Travel back in time at two famous landmarks in Old Delhi. Admire the red sandstone walls of the massive Red Fort, which once housed Mughal emperors. Afterwards, take a short walk to Jama Masjid, one of the largest mosques in India. Climb to the top of the minaret for stunning panoramic views of the city.
Wrap up your trip by visiting two more religious sites. The Lotus Temple is a stunning Bahá'í House of Worship with a distinctive lotus-shaped structure. After, head to the Akshardham Temple for a modern take on ancient Hindu architecture. The temple offers boat rides, gardens, and a light and sound show.
If you have more time, consider visiting the India Gate, the National Museum, or taking a food tour through Old Delhi. If you have less time, skip one of the temples or landmarks and spend more time exploring the city's vibrant street markets or sampling local street food.