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There is no plaque, no marker, nothing to tell you. But if you stand at Fifth Avenue and 58th Street, facing Grand Army Plaza, you are standing where the largest private home in New York City history once filled the entire block. It is one of the great hidden before-and-afters of the city, invisible to anyone who does not already know the story.
The 'then' is the Cornelius Vanderbilt II House, which stood from 1883 to 1926. At its full extent it was a six-story Chateauesque palace of pale limestone, designed by George B. Post and Richard Morris Hunt, that occupied the whole Fifth Avenue block front facing the plaza. It contained a two-story ballroom, a two-story dining room that doubled as an art gallery, and a five-story entrance hall. It was, and remains, the largest private residence ever built in the city.
The 'now' is the Bergdorf Goodman Building, completed in 1928, where luxury shoppers come and go all day. The transformation could hardly be more complete: from the single most exclusive private residence in America to one of the most famous department stores in the world, on the exact same patch of ground.

What gives this then-and-now its peculiar power is precisely the absence of any trace. With some lost buildings, a fragment survives, a doorway, a wall, a cornerstone. Here, there is nothing. The palace was erased so thoroughly that an unknowing visitor would never guess that anything but a department store had ever stood on the corner. The memory survives only in photographs.
And the photographs are striking. A 1900s image of the Vanderbilt mansion shows a turreted chateau dominating the plaza, carriages drawn up before it, the very picture of Gilded Age grandeur. Place that beside a present-day photograph of Bergdorf Goodman, and the contrast tells the whole story of the avenue's transformation in a single pair of pictures.
The speed of the change is, as always with these houses, hard to absorb. The mansion stood for just forty-three years. People who had seen it built were still alive when it came down. The largest private home the city ever produced did not fade slowly into history; it was deliberately demolished in 1926, within a single generation, because the land beneath it had become worth more than the palace itself.

This is what makes the corner of 58th and Fifth such a rewarding place to stand if you know its history. On the surface, it is simply a busy retail corner, indistinguishable in spirit from a hundred others. But beneath that surface lies one of the most dramatic substitutions in the city's history, a palace replaced by a store, exclusivity replaced by commerce, all on the same few thousand square feet.
A good then-and-now does not just show you that a building changed. It makes you feel the gap between two worlds. Here, the gap is enormous: the world of the Vanderbilts and the Four Hundred on one side, the world of modern luxury retail on the other, with nothing physical bridging them except the ground itself.
So the next time you pass Bergdorf Goodman, try the experiment. Pull up an old photograph of the Cornelius Vanderbilt II House on your phone, then look up at the store in front of you. Let your eye replace the limestone facade of the department store with the turrets and mansard roofs of the lost chateau. For a moment, you can almost see it, the grandest house in America, standing exactly where you stand.
That act of imaginative replacement is the whole point of a then-and-now. The building is gone, but the spot remains, and on that spot the past and the present press right up against each other, separated by a century and a single, total transformation.
Perhaps the strangest part is that nothing marks the spot. A building this important, the largest private home in the city's history, left behind not even a plaque. The only memorial is the knowledge itself, carried by the handful of people who know the story and pass it on. To stand on the corner aware of what was there is, in a sense, to become that memorial yourself, a living marker for a palace the city chose to forget.