District of Columbia

Those focus more on putting skill and try to mirror golf more closely. That course has walls like pool table bumpers.

The USGA Museum in Far Hills, NJ features the "Pynes" putting course, an 18-hole, 16,000-square-foot challenging mini-golf course designed with US Open-quality green speeds. It offers a realistic, challenging, and historically inspired putting experience on the grounds of the association's headquarters.
Key Features of the Pynes Putting Course at USGA Golf Museum and Library in Far Hills/Liberty Corner, NJ. Which features 18 holes with challenging, fast, and sloping surfaces, simulating professional, high-quality putting greens.
Accessibility: Included with museum admission, offering a unique,, high-end,, yet accessible,,,, putting experience.