Depart Delhi early morning, passing India Gate, Qutub Minar, and Humayun's Tomb en route. Qutub Minar, begun in 1193, marks the start of Muslim rule in Delhi — at 73 metres it's the tallest brick minaret in the world, and its five stacked storeys chart the changing architectural styles of the sultans who each added a level over more than a century. Humayun's Tomb, built decades later by a grieving widow for her husband, is often called the first true garden-tomb of Mughal India — the design that would eventually be perfected in the Taj Mahal. On arrival in Agra, visit Agra Fort, the red-sandstone stronghold from which the Mughal Empire was actually governed for generations. Tip: comfortable shoes matter here — Agra Fort's courtyards and stairways are uneven, and the walking adds up across a day that already includes three major stops. Overnight in Agra.