The 2011 Virginia earthquake that rattled D.C. inspired further research on fault lines that exist in the city — and whether they connect to each other.

Behind the fence is a sign that sort of explains the situation, albeit in as unhelpful a way as possible for the layman.

Fun fact: For a state defined by numerous rivers and streams, Maryland is utterly bereft of naturally occurring lakes, thanks to the fact that it was untouched by glaciers during the last ice age.