The Antram-Gray House is an early 18th century structure with a late 18th century addition and serves as the visitor center for Roger Williams National Memorial.

The Hahn Memorial  is dedicated to Isaac Hahn, the first person of Jewish faith to be elected to public office from Providence, and designed by architect Norman M. Isham.

Bernon Grove is a memorial to Gabriel Bernon, early Providence resident, founder of King's Chapel (today, St. John's Cathedral located across the street from the memorial), and owner of the lot containing the Roger Williams Spring.

17th Century Gardens
At Roger Williams National Memorial there are two interpretive gardens: a Native American garden and a Colonial Kitchen garden.