There are N number of Places with monuments having great Significance West Bengal has Victoria Memorial
Uttar Pradesh has Agra and Fathepur Sikri
Hyderabad
Hi, India is full of such hidden gems which you might not all cover in your lifetime. You need to plan on what is to be visited, tamilnadu will give you amazing monuments
Karnataka has lot of stuff to visit
Madhyapradesh is big and it may take time but there are really good monuments here
Madhya Pradesh, Gujarat. Gujarat also homes many World Heritage Sites and is a great place for people who like to visit monuments and want to explore history.