It has a number of monuments ranging from the world known such as Taj Mahal, Agra Fort and Fatehpur Sikri complex to the lesser known tombs such as Sikandra, Mariams tomb, Itmaduddaulahs tomb and Chini ka Rauza. Ram Bagh and Swami Bagh Temple at Dayal Bagh, may not be so famous but have an indelible impression in the hearts of the natives of the city with their own history to boast of.
Across the railway tracks from the Delhi Gate of Agra Fort, the Jami Masjid was built by Shah Jahan in 1648. An inscription over the main gate indicates that it was built in the name of Jahanara, Shah Jahan's daughter, who was eventually imprisoned with Shah Jahan by Aurangzeb.
Previously known as Araambagh, is the probably amongst one of the first Mughal monuments of India. Built by Emperor Babar in 1526 for his recreation, its architecture shows Afghani influences.
If you get the chance, Agra is well worth a visit. Almost any inclusive tour to the main sights of Northern India will include it most follow some variation on the theme of the golden triangle, the other points of which are Delhi and Jaipur. Apart from which, it's easy for any independent traveller to India to reach, only a few hours from Delhi by train or bus. There are any number of places to stay, of all styles and prices, from palace hotels and plushy multinationals, down to basic backpacker hostels at very basic prices.
The best time to go is between October and March, although prices will be predictably higher then than during the hot weather April to July or the monsoon that follows it. Go prepared for hassle and hubbub, beggars and thieves. Or, better still, go as a royal dignitary, have the place cleared for you in advance and avoid all that. Maybe then you will have a chance to see the Taj Mahal as it should be seen, as a teardrop on the cheek of time, in the words of Rabindranath Tagore. Such delicacy of perception is impossible at the regular tourist times.