Paris Top 30 Attractions - One-Two-Go Paris: The Quick Guide to Paris 2015 - page 125

Notre Dame Cathedral on the Île de la Cité as seen from the opposite direction
As well as the “Alternative Love Lock Bridge” by which you can cross to the island from
the east, there are three medieval buildings remaining which are well worth visiting (listed
from east to west):
1) The Cathedral of Notre Dame de Paris
2) Louis IX's Sainte-Chapelle
3) The Conciergerie prison