Searching for Secrets

Local experts search out some of New York's most remarkable hidden stories, from a 1916 terror attack's impact on Lady Liberty to a secret in the basement of the famous 21 Club.

San Francisco is America's ultimate boomtown, whose secret stories include a pair of giant Dutch windmills and an unassuming apartment block that was the location for a top-secret CIA experiment.

London is full of remarkable stories, from the Victorian gas lamp that helped solve the city's sewage problem to the surprising history behind Marble Arch.

Berlin's secrets include the surprising story behind the statue on top of the Brandenburg Gate and brewery tunnels that helped East Berliners escape.

Paris' remarkable secrets include the Phantom of the Opera's connection to the flood of the century, as well as the remnants of one of history's most terrifying inventions.

The hidden history of Singapore includes the secret symbolism behind the city's success and the stealthy jungle predator behind an 1860s rampage.