https://next-gen.materialsproject.org/materials/mp-23154 corresponds to the experimentally known ground-state of Br2. Unfortunately, the structure is completely distorted due to a known GGA error (https://doi.org/10.1002/cphc.201402890). It might be good to add a warning here. Previous versions of the DB still had a structure close to the experimental minmum, this one not. One can also see the experimental structure in the corresponding ICSD entries: Search Results - Access Structures
Same is true for I2.