The "ground zero", the explosion's hypocenter is marked today by the Hypocenter Cenotaph, the black monolith in the middle of this photo. The surrounding area is a beautiful but incredibly sad park, and as written on the monument plaque, it stands as "a symbol of the aspiration for world harmony".
EXIF info:
Nikon Df
Lens: 14mm F/2.8D
Focal Length: 14mm
Aperture: F/7.1
Shutter Speed: 1/640s
ISO Sensitivity: ISO 1000