The Gate can be visited
Town Fortification Nürnberg-Laufer Tor

In the northeast of Nuremberg's old town, the Laufer Tor is a part of the city fortifications. It is one of the four round towers of the city wall, formerly known as “Schwarz M.”
History+
The Laufer Tor was first documented in 1377 as an element of Nuremberg's last city wall. It took over the function of the older Laufer Schlagturm and served as a traffic artery for travelers on the Golden Road from Sulzbach and Prague, as well as the northern route to Bayreuth. During the Second Margrave War in 1552, the gate tower suffered damage.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Torre_Laufer,_N%C3%BAremberg,_Alemania,_2013-03-16,_DD_01.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 49.4577, 11.0882