Recent releases of genome three-dimensional (3D) structures have the potential 
to transform our understanding of genomes. Nonetheless, the storage technology 
and visualization tools need to evolve to offer to the scientific community fast 
and convenient access to these data. We introduce simultaneously a database 
system to store and query 3D genomic data (3DBG), and a 3D genome browser to 
visualize and explore 3D genome structures (3DGB). We benchmark 3DBG against 
state-of-the-art systems and demonstrate that it is faster than previous 
solutions, and importantly gracefully scales with the size of data. We also 
illustrate the usefulness of our 3D genome Web browser to explore human genome 
structures. The 3D genome browser is available at http://3dgb.cs.mcgill.ca/.