The Kongresshalle can be visited
Nazi party rally grounds-Kongresshalle

The Congress Hall on the former Nazi Party Rally Grounds in Nuremberg is a colossal, unfinished structure that reflects the architecture of the National Socialist era. The torso resembles ancient models.
History+
The Nazi Party Rally Grounds in southeastern Nuremberg served as the venue for the Nazi Party Congresses from 1933 to 1938. The overall planning of the area, which stretched over 16.5 square kilometers, was largely the work of Albert Speer and Walter Brugmann. The foundation stone for the Congress Hall, designed by Ludwig and Franz Ruff, was laid in 1935.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Rudolf Henkel
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: 49.4324, 11.1124