Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

"X" marks the spot of an echo chamber in the middle of a plaza.

Performers, intricate sets, and a real speakeasy tell the story of the 18th Amendment.