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A few figures that illustrate the sheer grandiose scale of the Grand Palais...

72,000 m2 (over 250,000 sq. ft) of floor space
The Nave: 200 m long, 50 m wide and 100 m level with the paddock
35 m high under the Nave, 45 m beneath the dome and 60 m beneath the campanile sphere.
1,075 m facade perimeter
8,500 metric tonnes of metal
6,000 metric tonnes of steel
60 metric tonnes of "mignonette green" paint in the Nave
200,000 metric tonnes of stone
1,500 workers on the site for the Universal Exhibition in 1900.
The Grand Palais has the largest glass ceiling of any building in Europe.