diff --git a/app/location/__init__.py b/app/location/__init__.py
index 1da5e9e5..43f80f6f 100644
--- a/app/location/__init__.py
+++ b/app/location/__init__.py
@@ -3,9 +3,18 @@
 from ..utils import countries
 from ..utils.populations import country_population
 
+from abc import abstractmethod, ABCMeta
+
+class ILocation(metaclass=ABCMeta):
+
+    @abstractmethod
+    def serialize():
+        """
+        Serializes the location into a dict.
+        """
 
 # pylint: disable=redefined-builtin,invalid-name
-class Location:  # pylint: disable=too-many-instance-attributes
+class Location(ILocation):  # pylint: disable=too-many-instance-attributes
     """
     A location in the world affected by the coronavirus.
     """
@@ -74,6 +83,7 @@ def serialize(self):
         }
 
 
+
 class TimelinedLocation(Location):
     """
     A location with timelines.
@@ -122,3 +132,5 @@ def serialize(self, timelines=False):
 
         # Return the serialized location.
         return serialized
+
+
diff --git a/app/utils/baseurls.py b/app/utils/baseurls.py
new file mode 100644
index 00000000..ccebf743
--- /dev/null
+++ b/app/utils/baseurls.py
@@ -0,0 +1,10 @@
+import enum
+
+class BaseUrl(str, enum.Enum):
+    """
+    A base url available for retrieving data.
+    """
+
+    JHU = "https://raw.githubusercontent.com/CSSEGISandData/2019-nCoV/master/csse_covid_19_data/csse_covid_19_time_series/"
+    CSBS = "https://facts.csbs.org/covid-19/covid19_county.csv"
+    NYT = "https://raw.githubusercontent.com/nytimes/covid-19-data/master/us-counties.csv"