It turns out all of the (or most of the) Baedeker Guides are online now, thanks to Emory University.
If you don't know, the Baedeker Guides were ostensibly travel guides but were really a kind of post-Victorian, early-car-tourism, pre-internet attempt to catalogue the contents of the entire planet in the form of tiny red books with fold-out maps. They were so monomaniacally detailed that one intelligence officer described them as "Written by spies for spies".
Here's one of the fold-out maps--keep in mind this fit in a book that was small enough to fit on your outstretched hand, without going past your fingertips:
Here's a random page about the National Gallery from a 1908 Berlin Guide:
Third Floor. (Lift, see p. 87.) The Anteroom (I) is decorated with good mural paintings by Paul Meyerheim, representing nature at the different seasons (covered at present). This room contains chiefly paintings and sculptures of the early 19th century. Paintings: to the left, *898. ./. G. v. Edlinger, Count Preysing; 605. Joh. Heinr. Tischbein, Family group; *568. Anton Graff, Portrait of himself; 606. ./. H. Tisch¬ bein, Councillor Ch. Fr. Robert; *218. Tassaert, General Zieten (bronze bust). *561. A. Graff, Portrait of himself; *b()3.Friedr. Tischbein, Lute-player; 484. A. Graff, Female portrait; 197,198. Gottfr. Scha¬ dow, Frederick William III. and Queen Luise (bronze busts); 554. J. A. Koch, Sabine landscape; 1060. J. Schnorr von Carolsfeld, Annunciation; above, *49S. Wilh. Schadow, Thorvaldsen, Wilhelm, and Rudolph Schadow; *856. Joh. Jac. Biedermann, Landscape near Partenkir- chen; 413. J. A. Koch, The convent of San Francesco di Civitella in the Sabine Mts. — *144. G. Schadow, Princess Frederica of Prussia (terracotta bust); *593. A. Graff, Henriette Herz; 908. Heinrich Filger, Princess Galizin; 577. Anna Dor. Therbusch, Henriette Herz as Hebe; *196. G. Schadow, Bust of Crown Princess Luise (plaster). — 1081. Rafael Mengs, Portrait of himself; 380. Fr. G. Weitsch, Alexander von Humboldt; 525. Ed. von Hews, Peter von Cornelius; 366. K. Chr. Vogel von Vogelstein, Ludwig Tieck, the poet; 525b. Ed. von Heuss, Friedr. Overbeck, the painter. — 201, 202. Gottfr. Schadow, Designs for monuments to Prince Leopold of Dessau and Zieten. — Smaller sculptures by G. Schadow and others. Room II, to the left, contains Frescoes from the history of...
They are completely fucking bananacrackers.
And like most things that are completely insane, they're of great interest to RPG fans. If you're running Call of Cthulhu you're totally sorted for every turn-of-the-century city and most of the countryside in the western world plus a few places outside of it. If you're running a fantasy world, just pick a random part of the Belgian seaside and start describing nearby hills and lighthouses.
I have a few of these at home--Egypt, Paris, and Southern France--picked up in London in Cecil Court (the famous street of cranky old London antique book dealers--the guy in the all-Lewis Carroll bookstore is so mindbendingly hateful I think Bernard Black was based on him). Every few months I pull one out and contemplate drawing all over it and turning Paris into some fantasy city I made up but I don't.
Anyway you don't really have to because yeah.