Visit St. Joseph's Cathedral, a stunning example of French colonial architecture located in the heart of Hanoi Old Quarter. This Roman Catholic cathedral, built in the late 19th century, features neo-gothic design elements and a towering bell tower. Step inside to admire the beautiful stained glass windows and peaceful atmosphere. If you're lucky, you may even catch a choir performance or a Sunday mass. The cathedral is a popular spot for both locals and tourists seeking solace and spiritual reflection.