Monday
Monday's psychological depth cannot be measured in metres, yet studies suggest the 'Monday Effect' causes a measurable 25% increase in heart attacks compared to other weekdays. The phenomenon penetrates every level of human society, from chief executives to schoolchildren, creating a universal experience of temporal dread that unites humanity more effectively than any geological wonder.
Grand Canyon
The Grand Canyon plunges to a maximum depth of 1,857 metres, exposing nearly two billion years of Earth's geological history. Its impact on visitors is profound but geographically limited. Approximately six million people visit annually, experiencing what park rangers describe as 'sublime terror.' The remainder of humanity continues unbothered.
VERDICT
Whilst the Grand Canyon's physical depth is undeniably impressive, Monday affects approximately 4.5 billion working adults simultaneously across the globe. The canyon requires travel; Monday requires only consciousness. Depth of spirit trumps depth of rock.