Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

The most confusing clock in New York.

A terrific purveyor of natural history objects and curios.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

World's first "penitentiary," meant to be humane, drove men insane.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

America's first public mental health facility.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The miraculous hydrant that saved the Mission District in 1906.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

Northern Ireland's Brobdingnagian stepping stones.