The Metropolitan Museum in New York opened the insides of some ancient Egyptian tombs last month but has suddenly had to close them. The “museum had removed protective glass screens from the tombs of Raemkai and Perneb Jan. 29, allowing visitors full views of interior limestone carvings for the first time in 90 years. But a crush of some 24,000 visitors since the unveiling has put the humidity at unacceptable limits.”