For centuries, the bones of some six million people were buried in the catacombs beneath the city. Curators are trying to preserve and modernize the tunnels while maintaining the spooky ambience.

A rare visit to a Khmer temple on Thailand and Cambodia’s border showed how deadly clashes between the two countries have scarred a heritage site.

With political activism off-limits, residents of St. Petersburg are finding purpose and community in the “politics of small deeds,” repairing and cleaning architectural treasures.