Can you turn up at Newtownstewart Castle without arranging entry?
Newtownstewart Castle on Townhall Street, BT78 4AX, is listed by the Department for Communities as open by arrangement, not as a permanently open walk-in attraction.
The early-17th-century ruin is in the town itself, above the River Strule. The official record provides a heritage enquiries contact and warns that charges may apply to arranged visits. A traveller may be able to see the exterior from surrounding public areas, but that does not confer permission to enter the managed monument or adjoining property.
Practical advice: Arrange any intended visit with the heritage team before travelling, and use normal town-centre parking rules. Do not rely on older attraction listings that describe a generic “open” status.