This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The only museum with its curator—and her pets—buried inside.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.