Most visitors day-trip or overnight in Agra just for the Taj Mahal, but Agra Fort and Fatehpur Sikri are worth the extra half-day.
Agra
Home of the Taj Mahal
1-2 days
Home of the Taj Mahal
Most visitors day-trip or overnight in Agra just for the Taj Mahal, but Agra Fort and Fatehpur Sikri are worth the extra half-day.