Uttar Pradesh
Agra
Almost everyone rushes Agra as a day trip from Delhi, and almost everyone regrets it — the Taj deserves a dawn and the city has a second monument nearly as good.
Go to the Taj at sunrise, and know that it closes on Fridays. The marble changes colour through the first hour in a way no photograph has ever conveyed; by nine the light has flattened and the crowd has arrived. If you only have one slot, take that one.
Agra Fort is the thing people skip and should not. Shah Jahan spent his last years imprisoned in it, looking downriver at the tomb he built for his wife, and you can stand where he stood. It is a working piece of Mughal military architecture rather than a monument to grief, and it is quieter.
For the view most people never see, cross the river to Mehtab Bagh in the late afternoon and look at the Taj from the back, across the Yamuna, with nobody in front of you.
The city outside the monuments is hard work — persistent touts, heavy traffic, little to hold you. Sleep here for the sunrise, then move on.