Campus Martius Museum in Marietta, Ohio, is a history museum that showcases the area's history and significance. It features exhibits on the Northwest Territory, the early settlers, and local artifacts, making it an important cultural site.

Mound Cemetery in Marietta is an important historical site. It features ancient burial mounds, and it is the resting place of many early American pioneers and veterans.

The Ohio River Museum is a maritime museum in Marietta, Ohio. It preserves the history of river navigation and showcases artifacts related to the Ohio River.

The Castle in Marietta is a historic building that now serves as a museum. It features unique architecture and tells the story of the city's history and culture.

The Basilica of Saint Mary of the Assumption is a historic church in Marietta, Ohio. Its beautiful architecture and rich history attract visitors who appreciate its art and spiritual significance.