The Royall House & Slave Quarters reopens today for its 2025 tour season. The museum will offer guided tours at 1, 2 and 3 p.m. each Saturday and Sunday through mid-October. Admission for guided tours of the mansion is $15 for adults, and $10 for seniors and students. Admission is always free for Royall House & Slave Quarters members; for children age 12 and under; for Massachusetts Teachers Association members and retirees; and for active duty military personnel and their…