For centuries, the vanished Inca fortress of Ancocagua existed only in lore. Now, at a mountaintop site in Peru, researchers are zeroing in on a discovery that could reshape what we know of the empire’s last days.

Each summer, the Common Ridings—among the world’s largest and oldest equestrian spectacles—culminate in a grand party in more than a dozen charming Scottish towns. But their origins are much less celebratory.

Dive into architectural gems, culinary hot spots, green spaces and the newest presidential library in the Midwest’s biggest city.