Well, this is a subjective question. But I will give you the places which will help you to get a feel of Agra. 1) Tajmahal - Without a doubt the most famous monument in the world. 2) Agra Fort - The second most famous monument in Agra, this fort offers a great view of Tajmahal. It is said that the fort was built by a man whom the Tajmahal was built for. 3) Fatehpur Sikri - This city was built by the Mughal emperor Akbar when he was just 16 to house his new bride. Remnants of this city can still be seen but it is not as breathtaking as they must have been in the past. 4) Agra Fort Railway Station - The main railway station in Agra, this station is next to the Agra fort and is worth a visit. 5) Itmad-ud-daulah - The tomb of the mad king's (Emperor Shah Jahan) favourite wife. 6) Tomb of its imam - The tomb of a Sufi saint who was a great friend of Emperor Akbar. 7) Akbar's Tomb - The resting place of the greatest Mughal Emperor of all time. 8) Nahargarh Fort - A small fort built by Emperor Akbar's grandson. 9) Ram Bagh - A garden which was the site of the marriage of Emperor Akbar.