Indiana Jones and the Last Crusade/Venice

Venice Library
When you first arrive in Venice, you will meet your contact Dr. Schneider and be brought to the library. In here, you will search for the entrance to catacombs, and optionally some books. The library is divided into sections, alternating between a window and two sets of shelves.

To find the books, you will need to select "what is", and move the cursor on the shelves until you see the word book (instead of books). As finding the books is more of a pixel hunt in addition to needing to scour multiple rooms, the three important ones will appear in fixes locations, best found by moving left:
 * How to fly a byplane. One shelf room left of the entrance, the bottom shelf room. It's used as an alternative to the Zepplin, and is optional.
 * Mein Kampf, found two shelf rooms left of the entrance, in the bottom shelf room, and on the right. It's used for bypassing guards later.
 * Secrets of Roman Catacombs, found three shelf rooms right of the entrance, in the bottom shelf room, and on the right. It shows the map of two floors of the catacomb maze, and is optional if you copied tha map elsewhere.

For the catacombs, you will first need to find some items. One of the window rooms will have a metal post and a red cordon. Pick both of them up. Next, use the grail diary - you should see a stained glass window and some text. Find the window room that matches what's in the diary, making sure angels are facing the correct direction and the image above the shield matches. The text should say something similar to "third on the right"; each window has two pillars to the side with three roman numerals. The left or right indicates which pillar to read, and the number indicates which of the numerals is referenced. Use the metal post on the matching roman numeral to break the floor and enter the catacombs.

If you selected the wrong tile, you can get another metal post to retry.