The Louvre in Paris is raising ticket prices for many visitors to fund renovations and security after recent challenges. Admission to the world’s most visited museum will increase to 32 euros, up from 22 euros for visitors from many non-European countries. French labor unions say the two-tier pricing change undermines the museum’s universal mission. The theft of French crown jewels from the museum in October intensified scrutiny of its security. Overcrowding, strikes and aging infrastructure are also among the stresses highlighting the need for more funding.