You’ll be shocked — shocked! — to learn that renting an apartment near a Metro station isn’t cheap. In fact, it’s downright expensive to live near public transportation in and around Washington.

The blog We Love DC has created a pretty fascinating heat map of rental housing prices in the D.C. metro area that shows what living on the left spur of the Red Line or along Virginia’s Orange Line can do to rents.

For those looking for deals, it’s worth noting that the right spur of the Red Line and the Maryland side of the Orange and Blue lines are less expensive. Blogger Fedward Potz got the idea when he saw a heat map of apartment prices in Boston. Similar maps have also been made for San Francisco and Chicago.