But they are without wall, of course, and you can cross the border without showing ID-papers, like elsewhere within the Schengen-countries.
Similar to other German/Dutch towns, this as an example:
One street in Dinxperlo, Heelweg, is partly German. The road itself lies in the Netherlands, but one side of the housing zone is in Germany (where it is called Hellweg). The houses there belong to the small town of Suderwick, which might be translated as "southern area". Also, Dinxperlo houses a shared Dutch-German police station.
and Železná Ruda/Czech Republic
It is one of a trio of connected places in the area. The other two are Železná Ruda (German: Böhmisch Eisenstein or Markt Eisenstein) and Špičák (German: Dorf Eisenstein), both in Czech Republic. Železná Ruda lies 2 kilometres northeast from Bayerisch Eisenstein. The town's railway station is split by the border.