Dear adakistkrazia, I would love to suggest you top most places to visit in New Delhi.
1. Red Fort
2. Jama Masjid
3. Chandni Chowk
4. Humayun's Tomb
5. Lodi Gardens
6. Qutab Minar
7. Gandhi Smriti
8. India Gate
9. Garden of Five Senses
10. Bahai (Lotus) Temple
There are many worth seeing places in Delhi as my fellow member have already told you but when you talk about staying in Agra thanks to new constructed Yamuna Expressway that not only cuts down the distance between Delhi and Agra from the earlier 210 km to 165 km but also reduces the traveling time to two hours and by hiring a cab you can cross this distance without complag about an exhaustive journey through crammed roads.
Delhi is the center of attraction for the people of the world for its cultural heritage, historical monuments, enchanting forts, religious places, museums, gardens, etc. Besides this a sight-seeing tour of old Delhi would bring about visiting, the Delhi tour has Parliament House, Rashtrapati Bhavan, Jantar Mantar, Jama Masjid, Old Fort, National museum and many monuments, memorials, and gardens attract the people from all corners of the earth. The best time for Delhi tour is from October to March when the weather is at its best. During this period flowers are at their blooming best, the weather is pleasant and enjoyable to experience incredible Delhi tour.
Red Fort, Delhi Juma Masjid, Chandni Chowk, HUmayun's Tomb, Lodi Gardens, Parliament House, Jantar Mantar, Qutab Minar, Gandhi Smrithi, India Gate, Garden of Five Senses and Lotus Temple.