Cross the multi-laned Ringstrasse (being careful of tram, bike, and car traffic) and head toward the imposing monument seated between the two museums. 
Here, you’ll meet Empress Maria Theresa and her extensive family, hear about the extensive holdings of the Natural History Museum (including the world’s oldest-known human-carved statuettes), get the run-down on the collection at the Art History Museum (the crime scene of one of history’s biggest art heists), and grab the opportunity to see the city skyline from above with an optional free trip to a rooftop patio in the MQ. 
A map of the entire route can be found at the following link: https://tinyurl.com/zxjv65n6