The main concourse at Welwyn Roman Baths. - Credit: Welwyn Hatfield Borough Council Welwyn Roman Baths are set to reopen this weekend in time for the school half-term holiday. The heritage site will admit visitors again from Saturday, May 29, following the resumption of the mill and exhibition tours at Mill Green Museum and Mill on May 17, 2021, when the country moved to Step 3 of the government's roadmap out of lockdown. A skeleton on display at Welwyn Roman Baths. - Credit: Welwyn Hatfield Borough Council The plan will see this hidden gem, located under the A1(M) motorway, reopening for pre-booked tours at weekends and every day during the Hertfordshire school holidays.