At the present time, the one place of pilgrimage that is known is Elisabeth Leseur’s gravesite, just outside of Paris.

Cimetiere Parisien de Bagneux,
45, Avenue Marx-Dormoy, 92220

Bagneux (Hautes-de-Seine) among the graves of the Dominican Sisters of Catherine of Siena located in the 13th division, 18th row, 1st grave.

The homepage of the cemetery may be found here.
http://equipement.paris.fr/cimetiere-parisien-de-bagneux-4500

Photos courtesy of France Roseau.