The Aztec capital reconstructed by Thomas Kole and collaborators:
A global heat map based on data collected by the Strava fitness app, representing 700 million activities; a total distance of 16 billion km; and a total recorded activity duration of 100 thousand years.
Enlargeable topographic map of the contiguous United States with hypsometric tints. Source: Wikipedia.
Openstreetmap, the free, detailed map of the world.
Maps of Switzerland with a time shift function.
Previous posts: Animated historical maps; maps of WWI and WWII, German relative real estate prices, European population growth, and political risk.
A political risk map by Aon to play around with; and a PDF document.