The dromos of the Treasury of Atreus is 35 meters long by 6 meters wide.

The dromos (corridor leading up to the entrance) is 35m long by 6m wide and its carefully laid stones were waterproofed in the back with a layer of clay.
More about the Treasury of Atreus..

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Architecture Bronze Age Corbel Construction Doors and Gates Funerary Mycenae Mycenaean Original Photo Tholos Tomb Tombs